feat: tab system with per-tab agents, DB persistence, and DaisyUI tabs-lift UI

- Add tabs, messages, and settings tables to SQLite database
- Backend: refactor AgentManager to manage per-tab Agent instances via Map<tabId, TabAgent>
- Backend: WebSocket events tagged with tabId for multiplexing
- Backend: tab CRUD routes (create, list, update, archive, messages)
- Backend: persist user and assistant messages to DB during chat
- Frontend: new tabStore replaces single chatStore with multi-tab reactive state
- Frontend: TabBar component using DaisyUI tabs-lift style with status dots
- Frontend: Settings sidebar panel for title generation model selection
- Frontend: wire ChatPanel, ChatInput, Header to use tabStore
- Fix HMR listener accumulation via wsClient.clearCallbacks()
- Delete old single-chat chatStore (chat.svelte.ts)

9 files changed, 656 insertions, 450 deletions

diff --git a/packages/frontend/src/lib/chat.svelte.ts b/packages/frontend/src/lib/chat.svelte.ts
deleted file mode 100644
index e211203..0000000
--- a/packages/frontend/src/lib/chat.svelte.ts
+++ /dev/null
@@ -1,414 +0,0 @@
-import { config } from "./config.js";
-import type { AgentEvent, ChatMessage, ContentSegment, DebugInfo, LogEntry, PermissionPrompt, TaskItem } from "./types.js";
-import { wsClient } from "./ws.svelte.js";
-
-function generateId() {
-	return Math.random().toString(36).slice(2, 11);
-}
-
-function makeDebugInfo(overrides: Partial<DebugInfo> = {}): DebugInfo {
-	return {
-		timestamp: new Date().toISOString(),
-		model: "deepseek-v4-flash",
-		apiBase: config.apiBase,
-		connectionStatus: wsClient.connectionStatus,
-		...overrides,
-	};
-}
-
-function formatConversation(msgs: ChatMessage[], activeModelId: string | null): string {
-	const lines: string[] = [];
-	lines.push("=== Dispatch Conversation ===");
-	lines.push(`Exported: ${new Date().toISOString()}`);
-	lines.push(`Active Model: ${activeModelId ?? "default"}`);
-	lines.push("");
-
-	for (const msg of msgs) {
-		if (msg.role === "system") {
-			lines.push(`--- System ---`);
-			for (const seg of msg.content) {
-				if (seg.type === "text") lines.push(seg.text);
-			}
-			lines.push("");
-			continue;
-		}
-
-		const role = msg.role === "user" ? "User" : "Assistant";
-		lines.push(`--- ${role} ---`);
-
-		if (msg.thinking) {
-			lines.push(`  [Thinking]: ${msg.thinking}`);
-		}
-
-		for (const seg of msg.content) {
-			if (seg.type === "text") {
-				lines.push(seg.text);
-			} else if (seg.type === "tool-call") {
-				lines.push(`  [Tool: ${seg.name}]`);
-				lines.push(`  Args: ${JSON.stringify(seg.arguments)}`);
-				if (seg.result !== undefined) {
-					const prefix = seg.isError ? "  Error: " : "  Result: ";
-					lines.push(`${prefix}${seg.result}`);
-				}
-			}
-		}
-
-		if (msg.debugInfo) {
-			lines.push("  [Debug Info]");
-			lines.push(`  Timestamp: ${msg.debugInfo.timestamp}`);
-			if (msg.debugInfo.error) lines.push(`  Error: ${msg.debugInfo.error}`);
-			if (msg.debugInfo.model) lines.push(`  Model: ${msg.debugInfo.model}`);
-			if (msg.debugInfo.apiBase) lines.push(`  API Base: ${msg.debugInfo.apiBase}`);
-			if (msg.debugInfo.connectionStatus)
-				lines.push(`  Connection: ${msg.debugInfo.connectionStatus}`);
-			if (msg.debugInfo.agentStatus) lines.push(`  Agent Status: ${msg.debugInfo.agentStatus}`);
-			if (msg.debugInfo.httpStatus) lines.push(`  HTTP Status: ${msg.debugInfo.httpStatus}`);
-			if (msg.debugInfo.httpBody) lines.push(`  HTTP Body: ${msg.debugInfo.httpBody}`);
-			if (msg.debugInfo.rawEvent)
-				lines.push(`  Raw Event: ${JSON.stringify(msg.debugInfo.rawEvent)}`);
-		}
-
-		lines.push("");
-	}
-
-	return lines.join("\n");
-}
-
-function createChatStore() {
-	let messages: ChatMessage[] = $state([]);
-	let agentStatus: "idle" | "running" | "error" = $state("idle");
-	let activeKeyId: string | null = $state(null);
-	let activeModelId: string | null = $state(null);
-	let reasoningEffort: string = $state("max");
-	let isConnected = $state(false);
-	let currentAssistantId: string | null = null;
-	let pendingPermissions: PermissionPrompt[] = $state([]);
-	let permissionLog: LogEntry[] = $state([]);
-	let tasks: TaskItem[] = $state([]);
-	let configReloaded = $state(false);
-
-	wsClient.onEvent((event) => {
-		handleEvent(event);
-	});
-
-	$effect.root(() => {
-		$effect(() => {
-			isConnected = wsClient.connectionStatus === "connected";
-		});
-	});
-
-	function getCurrentAssistantMessage(): ChatMessage | null {
-		if (!currentAssistantId) return null;
-		return messages.find((m) => m.id === currentAssistantId) ?? null;
-	}
-
-	function ensureCurrentAssistantMessage(): ChatMessage {
-		let msg = getCurrentAssistantMessage();
-		if (!msg) {
-			const id = generateId();
-			currentAssistantId = id;
-			const newMsg: ChatMessage = {
-				id,
-				role: "assistant",
-				content: [],
-				thinking: "",
-				isStreaming: true,
-			};
-			messages = [...messages, newMsg];
-			msg = newMsg;
-		}
-		return msg;
-	}
-
-	function handleEvent(event: AgentEvent) {
-		switch (event.type) {
-			case "status": {
-				agentStatus = event.status;
-				if (event.status === "idle" || event.status === "error") {
-					currentAssistantId = null;
-				}
-				break;
-			}
-				case "reasoning-delta": {
-				ensureCurrentAssistantMessage();
-				messages = messages.map((m) => {
-					if (m.id === currentAssistantId) {
-						return { ...m, thinking: (m.thinking ?? "") + event.delta };
-					}
-					return m;
-				});
-				break;
-			}
-		case "text-delta": {
-				ensureCurrentAssistantMessage();
-				messages = messages.map((m) => {
-					if (m.id === currentAssistantId) {
-						const segments = [...m.content];
-						const last = segments[segments.length - 1];
-						if (last && last.type === "text") {
-							segments[segments.length - 1] = { ...last, text: last.text + event.delta };
-						} else {
-							segments.push({ type: "text", text: event.delta });
-						}
-						return { ...m, content: segments, isStreaming: true };
-					}
-					return m;
-				});
-				break;
-			}
-			case "tool-call": {
-				ensureCurrentAssistantMessage();
-				messages = messages.map((m) => {
-					if (m.id === currentAssistantId) {
-					const segments: ContentSegment[] = [
-						...m.content,
-						{
-							type: "tool-call",
-							id: event.toolCall.id,
-							name: event.toolCall.name,
-							arguments: event.toolCall.arguments,
-						},
-					];
-						return { ...m, content: segments };
-					}
-					return m;
-				});
-				break;
-			}
-			case "tool-result": {
-				messages = messages.map((m) => {
-					if (m.id === currentAssistantId) {
-						return {
-							...m,
-							content: m.content.map((seg) => {
-								if (seg.type === "tool-call" && seg.id === event.toolResult.toolCallId) {
-									return { ...seg, result: event.toolResult.result, isError: event.toolResult.isError };
-								}
-								return seg;
-							}),
-						};
-					}
-					return m;
-				});
-				break;
-			}
-			case "done": {
-				messages = messages.map((m) => {
-					if (m.id === currentAssistantId) {
-						return { ...m, isStreaming: false };
-					}
-					return m;
-				});
-				currentAssistantId = null;
-				break;
-			}
-			case "error": {
-				const errMsg: ChatMessage = {
-					id: generateId(),
-					role: "assistant",
-					content: [{ type: "text", text: `Error: ${event.error}` }],
-					isStreaming: false,
-					debugInfo: makeDebugInfo({
-						error: event.error,
-						agentStatus,
-						rawEvent: event,
-					}),
-				};
-				messages = [...messages, errMsg];
-				currentAssistantId = null;
-				agentStatus = "error";
-				break;
-			}
-			case "permission-prompt": {
-				pendingPermissions = event.pending;
-				break;
-			}
-			case "task-list-update": {
-				tasks = event.tasks;
-				break;
-			}
-			case "config-reload": {
-				configReloaded = true;
-				setTimeout(() => {
-					configReloaded = false;
-				}, 2500);
-				break;
-			}
-			case "shell-output": {
-				messages = messages.map((m) => {
-					if (m.id === currentAssistantId) {
-						// Find the last tool-call segment
-						const segments = [...m.content];
-						let found = false;
-						for (let i = segments.length - 1; i >= 0; i--) {
-							const seg = segments[i];
-							if (seg && seg.type === "tool-call") {
-								segments[i] = {
-									...seg,
-									shellOutput: {
-										stdout: (seg.shellOutput?.stdout ?? "") + (event.stream === "stdout" ? event.data : ""),
-										stderr: (seg.shellOutput?.stderr ?? "") + (event.stream === "stderr" ? event.data : ""),
-									},
-								};
-								found = true;
-								break;
-							}
-						}
-						if (!found) return m; // no tool-call segment yet
-						return { ...m, content: segments };
-					}
-					return m;
-				});
-				break;
-			}
-		}
-	}
-
-	async function sendMessage(text: string) {
-		const userMsg: ChatMessage = {
-			id: generateId(),
-			role: "user",
-			content: [{ type: "text", text }],
-		};
-		messages = [...messages, userMsg];
-		currentAssistantId = null;
-
-		const url = `${config.apiBase}/chat`;
-		try {
-			const res = await fetch(url, {
-				method: "POST",
-				headers: { "Content-Type": "application/json" },
-				body: JSON.stringify({ 
-					message: text,
-					...(activeKeyId && activeModelId ? { keyId: activeKeyId, modelId: activeModelId } : {}),
-					reasoningEffort,
-				}),
-			});
-			if (!res.ok) {
-				const body = await res.text();
-				const errMsg: ChatMessage = {
-					id: generateId(),
-					role: "assistant",
-					content: [{ type: "text", text: `Error: Failed to send message (HTTP ${res.status})` }],
-					isStreaming: false,
-					debugInfo: makeDebugInfo({
-						error: `POST ${url} returned ${res.status}`,
-						agentStatus,
-						httpStatus: res.status,
-						httpBody: body,
-					}),
-				};
-				messages = [...messages, errMsg];
-			}
-		} catch (err) {
-			const errorText = err instanceof Error ? err.message : String(err);
-			const errMsg: ChatMessage = {
-				id: generateId(),
-				role: "assistant",
-				content: [{ type: "text", text: "Error: Could not reach the server" }],
-				isStreaming: false,
-				debugInfo: makeDebugInfo({
-					error: `POST ${url} failed: ${errorText}`,
-					agentStatus,
-				}),
-			};
-			messages = [...messages, errMsg];
-		}
-	}
-
-	function copyConversation(): string {
-		return formatConversation(messages, activeModelId);
-	}
-
-	function changeModel(keyId: string, modelId: string) {
-		const previousModel = activeModelId;
-		activeKeyId = keyId;
-		activeModelId = modelId;
-
-		if (previousModel && previousModel !== modelId) {
-			const systemMsg: ChatMessage = {
-				id: generateId(),
-				role: "system",
-				content: [{ type: "text", text: `Model changed from ${previousModel} to ${modelId}` }],
-			};
-			messages = [...messages, systemMsg];
-		} else if (!previousModel) {
-			const systemMsg: ChatMessage = {
-				id: generateId(),
-				role: "system",
-				content: [{ type: "text", text: `Model set to ${modelId}` }],
-			};
-			messages = [...messages, systemMsg];
-		}
-	}
-
-	function setKey(keyId: string) {
-		activeKeyId = keyId;
-		// Clear model when key changes since available models depend on the key
-		activeModelId = null;
-	}
-
-	function replyPermission(id: string, reply: "once" | "always" | "reject") {
-		if (wsClient.connectionStatus !== "connected") {
-			// WebSocket is not connected; skip optimistic removal to avoid losing the prompt
-			return;
-		}
-		const prompt = pendingPermissions.find((p) => p.id === id);
-		wsClient.send({ type: "permission-reply", id, reply });
-		pendingPermissions = pendingPermissions.filter((p) => p.id !== id);
-		if (prompt) {
-			const entry: LogEntry = {
-				id: generateId(),
-				permission: prompt.permission,
-				patterns: prompt.patterns,
-				action: reply,
-				timestamp: new Date().toISOString(),
-				description: prompt.description,
-			};
-			permissionLog = [...permissionLog, entry];
-		}
-	}
-
-	function clear() {
-		messages = [];
-		currentAssistantId = null;
-		agentStatus = "idle";
-	}
-
-	return {
-		get messages() {
-			return messages;
-		},
-		get agentStatus() {
-			return agentStatus;
-		},
-		get isConnected() {
-			return isConnected;
-		},
-		get pendingPermissions() {
-			return pendingPermissions;
-		},
-		get permissionLog() {
-			return permissionLog;
-		},
-		get tasks() {
-			return tasks;
-		},
-		get configReloaded() {
-			return configReloaded;
-		},
-		sendMessage,
-		handleEvent,
-		replyPermission,
-		copyConversation,
-		clear,
-		changeModel,
-		setKey,
-		get activeKeyId() { return activeKeyId; },
-		get activeModelId() { return activeModelId; },
-		get reasoningEffort() { return reasoningEffort; },
-		set reasoningEffort(value: string) { reasoningEffort = value; },
-	};
-}
-
-export const chatStore = createChatStore();
diff --git a/packages/frontend/src/lib/components/ChatInput.svelte b/packages/frontend/src/lib/components/ChatInput.svelte
index 92c78b9..9563a9f 100644
--- a/packages/frontend/src/lib/components/ChatInput.svelte
+++ b/packages/frontend/src/lib/components/ChatInput.svelte
@@ -1,9 +1,9 @@
 <script lang="ts">
-import { chatStore } from "../chat.svelte.js";
+import { tabStore } from "../tabs.svelte.js";
 
 let inputEl: HTMLInputElement | undefined;
 let inputValue = $state("");
-const isDisabled = $derived(chatStore.agentStatus === "running");
+const isDisabled = $derived((tabStore.activeTab?.agentStatus ?? "idle") === "running");
 
 $effect(() => {
 	inputEl?.focus();
@@ -20,7 +20,7 @@ function submit() {
 	const text = inputValue.trim();
 	if (!text || isDisabled) return;
 	inputValue = "";
-	chatStore.sendMessage(text);
+	tabStore.sendMessage(text);
 }
 </script>
 
diff --git a/packages/frontend/src/lib/components/ChatPanel.svelte b/packages/frontend/src/lib/components/ChatPanel.svelte
index 11c3b5d..24d8c7f 100644
--- a/packages/frontend/src/lib/components/ChatPanel.svelte
+++ b/packages/frontend/src/lib/components/ChatPanel.svelte
@@ -1,13 +1,14 @@
 <script lang="ts">
 	import { untrack } from "svelte";
-	import { chatStore } from "../chat.svelte.js";
-	import { wsClient } from "../ws.svelte.js";
+	import { tabStore } from "../tabs.svelte.js";
 	import ChatMessageComponent from "./ChatMessage.svelte";
 
 	let messagesEl: HTMLDivElement | undefined;
 	let userScrolledUp = $state(false);
 	let isAutoScrolling = false;
 
+	const messages = $derived(tabStore.activeTab?.messages ?? []);
+
 	function isNearBottom(el: HTMLElement): boolean {
 		return el.scrollHeight - el.scrollTop - el.clientHeight < 64;
 	}
@@ -32,8 +33,7 @@
 	}
 
 	$effect(() => {
-		// Trigger on any message appended; track length explicitly
-		const count = chatStore.messages.length;
+		const count = messages.length;
 		void count;
 		if (messagesEl) {
 			untrack(() => {
@@ -44,27 +44,6 @@
 </script>
 
 <div class="flex flex-col h-full">
-	<!-- Status bar -->
-	<div class="flex items-center gap-3 px-4 py-2 bg-base-200 border-b border-base-300 text-xs">
-		<span class="flex items-center gap-1.5">
-			<span class="status status-sm {wsClient.connectionStatus === 'connected' ? 'status-success' : wsClient.connectionStatus === 'connecting' ? 'status-warning' : 'status-error'}"></span>
-			<span class="capitalize text-base-content/70">{wsClient.connectionStatus}</span>
-		</span>
-		<span class="text-base-content/50">|</span>
-		<span class="text-base-content/70">
-			Agent:
-			<span
-				class="font-semibold {chatStore.agentStatus === 'running'
-					? 'text-warning'
-					: chatStore.agentStatus === 'error'
-						? 'text-error'
-						: 'text-success'}"
-			>
-				{chatStore.agentStatus === "running" ? "running..." : chatStore.agentStatus}
-			</span>
-		</span>
-	</div>
-
 	<!-- Messages -->
 	<div class="relative flex-1 min-h-0">
 		<div
@@ -75,12 +54,12 @@
 				isAutoScrolling = false;
 			}}
 		>
-			{#if chatStore.messages.length === 0}
+			{#if messages.length === 0}
 				<div class="flex items-center justify-center h-full text-base-content/40 text-sm">
 					Send a message to start a conversation
 				</div>
 			{/if}
-			{#each chatStore.messages as message (message.id)}
+			{#each messages as message (message.id)}
 				<ChatMessageComponent {message} />
 			{/each}
 		</div>
diff --git a/packages/frontend/src/lib/components/Header.svelte b/packages/frontend/src/lib/components/Header.svelte
index 721a773..ada5500 100644
--- a/packages/frontend/src/lib/components/Header.svelte
+++ b/packages/frontend/src/lib/components/Header.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
-import { chatStore } from "../chat.svelte.js";
+import { tabStore } from "../tabs.svelte.js";
+import { wsClient } from "../ws.svelte.js";
 import ThemeSwitcher from "./ThemeSwitcher.svelte";
 
 const { onToggleSidebar }: { onToggleSidebar: () => void } = $props();
@@ -12,7 +13,7 @@ function resetCopyLabel() {
 }
 
 async function handleCopy() {
-	const text = chatStore.copyConversation();
+	const text = tabStore.copyConversation();
 	try {
 		await navigator.clipboard.writeText(text);
 		copyLabel = "Copied";
@@ -29,8 +30,9 @@ async function handleCopy() {
 		<span class="text-xl font-bold tracking-tight">Dispatch</span>
 	</div>
 	<div class="navbar-end flex items-center gap-3">
-		<span class="text-xs text-base-content/60 hidden sm:block">
-			{chatStore.activeModelId ?? "Default Model"}
+		<span class="flex items-center gap-1.5 text-xs text-base-content/60">
+			<span class="status status-sm {wsClient.connectionStatus === 'connected' ? 'status-success' : wsClient.connectionStatus === 'connecting' ? 'status-warning' : 'status-error'}"></span>
+			<span class="capitalize">{wsClient.connectionStatus}</span>
 		</span>
 		<button
 			type="button"
@@ -54,7 +56,7 @@ async function handleCopy() {
 			onclick={onToggleSidebar}
 			aria-label="Toggle sidebar"
 		>
-			☰ Sidebar
+			Sidebar
 		</button>
 	</div>
 </header>
diff --git a/packages/frontend/src/lib/components/SettingsPanel.svelte b/packages/frontend/src/lib/components/SettingsPanel.svelte
new file mode 100644
index 0000000..8449aa4
--- /dev/null
+++ b/packages/frontend/src/lib/components/SettingsPanel.svelte
@@ -0,0 +1,128 @@
+<script lang="ts">
+	import type { KeyInfo } from "../types.js";
+
+	const {
+		keys = [],
+		apiBase = "",
+	}: {
+		keys?: KeyInfo[];
+		apiBase?: string;
+	} = $props();
+
+	let titleKeyId = $state<string | null>(null);
+	let titleModelId = $state<string | null>(null);
+	let availableModels = $state<string[]>([]);
+	let loadingModels = $state(false);
+	let saving = $state(false);
+	let saved = $state(false);
+
+	async function loadSettings(): Promise<void> {
+		try {
+			const res = await fetch(`${apiBase}/tabs/settings/title-model`);
+			if (!res.ok) return;
+			const data = await res.json() as { keyId: string | null; modelId: string | null };
+			titleKeyId = data.keyId;
+			if (titleKeyId) {
+				await loadModelsForKey(titleKeyId);
+			}
+			// Set model AFTER options are loaded so the select can match the value
+			titleModelId = data.modelId;
+		} catch {
+			// ignore
+		}
+	}
+
+	async function loadModelsForKey(keyId: string): Promise<void> {
+		loadingModels = true;
+		try {
+			const res = await fetch(`${apiBase}/models/available?keyId=${encodeURIComponent(keyId)}`);
+			if (!res.ok) { availableModels = []; return; }
+			const data = await res.json() as { models: string[] };
+			availableModels = data.models ?? [];
+		} catch {
+			availableModels = [];
+		} finally {
+			loadingModels = false;
+		}
+	}
+
+	async function onKeyChange(e: Event): Promise<void> {
+		const select = e.target as HTMLSelectElement;
+		titleKeyId = select.value || null;
+		titleModelId = null;
+		availableModels = [];
+		if (titleKeyId) {
+			await loadModelsForKey(titleKeyId);
+		}
+	}
+
+	async function onModelChange(e: Event): Promise<void> {
+		const select = e.target as HTMLSelectElement;
+		titleModelId = select.value || null;
+	}
+
+	async function saveSettings(): Promise<void> {
+		saving = true;
+		try {
+			await fetch(`${apiBase}/tabs/settings/title-model`, {
+				method: "PUT",
+				headers: { "Content-Type": "application/json" },
+				body: JSON.stringify({ keyId: titleKeyId, modelId: titleModelId }),
+			});
+			saved = true;
+			setTimeout(() => { saved = false; }, 2000);
+		} catch {
+			// ignore
+		} finally {
+			saving = false;
+		}
+	}
+
+	$effect(() => {
+		void loadSettings();
+	});
+</script>
+
+<div class="flex flex-col gap-3">
+	<div class="text-xs font-semibold text-base-content/50 uppercase tracking-wide">Settings</div>
+
+	<div class="flex flex-col gap-2">
+		<p class="text-xs text-base-content/70">Title Generation Model</p>
+		<p class="text-xs text-base-content/40">Used to generate short titles for new tabs after the first message.</p>
+
+		<label class="text-xs text-base-content/60">Key</label>
+		<select class="select select-bordered select-sm w-full" onchange={onKeyChange} value={titleKeyId ?? ""}>
+			<option value="">Select a key...</option>
+			{#each keys as key (key.id)}
+				<option value={key.id}>{key.id} ({key.provider})</option>
+			{/each}
+		</select>
+
+		<label class="text-xs text-base-content/60">Model</label>
+		<select
+			class="select select-bordered select-sm w-full"
+			onchange={onModelChange}
+			value={titleModelId ?? ""}
+			disabled={!titleKeyId || loadingModels}
+		>
+			<option value="">{loadingModels ? "Loading models..." : "Select a model..."}</option>
+			{#each availableModels as model (model)}
+				<option value={model}>{model}</option>
+			{/each}
+		</select>
+
+		<button
+			class="btn btn-sm btn-primary w-full mt-1"
+			disabled={saving || !titleKeyId || !titleModelId}
+			onclick={saveSettings}
+		>
+			{#if saving}
+				<span class="loading loading-spinner loading-xs"></span>
+			{:else if saved}
+				Saved
+			{:else}
+				Save
+			{/if}
+		</button>
+	</div>
+</div>
diff --git a/packages/frontend/src/lib/components/SidebarPanel.svelte b/packages/frontend/src/lib/components/SidebarPanel.svelte
index e5536de..7e71bd5 100644
--- a/packages/frontend/src/lib/components/SidebarPanel.svelte
+++ b/packages/frontend/src/lib/components/SidebarPanel.svelte
@@ -7,6 +7,7 @@
 	import PermissionLog from "./PermissionLog.svelte";
 	import KeyUsage from "./KeyUsage.svelte";
 	import ClaudeReset from "./ClaudeReset.svelte";
+	import SettingsPanel from "./SettingsPanel.svelte";
 	import type { TaskItem, LogEntry, KeyInfo } from "../types.js";
 
 	const {
@@ -41,7 +42,7 @@
 	let nextId = 0;
 	let panels = $state<Panel[]>([{ id: nextId++, selected: "Current Model" }]);
 
-	const viewOptions = ["Select a view", "Current Model", "Key Usage", "Claude Reset", "Model Status", "Tasks", "Config", "Skills", "Permission Log"];
+	const viewOptions = ["Select a view", "Current Model", "Key Usage", "Claude Reset", "Model Status", "Tasks", "Config", "Skills", "Permission Log", "Settings"];
 
 	function addPanel() {
 		panels = [...panels, { id: nextId++, selected: "Select a view" }];
@@ -114,6 +115,8 @@
 					<SkillsBrowser {apiBase} />
 				{:else if panel.selected === "Permission Log"}
 					<PermissionLog entries={permissionLog} />
+				{:else if panel.selected === "Settings"}
+					<SettingsPanel {keys} {apiBase} />
 				{/if}
 			</div>
 		</div>
diff --git a/packages/frontend/src/lib/components/TabBar.svelte b/packages/frontend/src/lib/components/TabBar.svelte
new file mode 100644
index 0000000..d1a3936
--- /dev/null
+++ b/packages/frontend/src/lib/components/TabBar.svelte
@@ -0,0 +1,47 @@
+<script lang="ts">
+	import { tabStore } from "../tabs.svelte.js";
+
+	function statusColor(status: string): string {
+		if (status === "running") return "bg-warning";
+		if (status === "error") return "bg-error";
+		return "bg-success";
+	}
+</script>
+
+<div class="overflow-x-auto bg-base-200 flex-shrink-0">
+	<div role="tablist" class="tabs tabs-lift min-w-max">
+		<!-- New tab button — always first -->
+		<button
+			type="button"
+			class="tab"
+			onclick={() => tabStore.createNewTab()}
+			aria-label="New tab"
+		>
+			+
+		</button>
+
+		{#each tabStore.tabs as tab (tab.id)}
+			<!-- svelte-ignore a11y_no_static_element_interactions -->
+			<div
+				role="tab"
+				class="tab {tab.id === tabStore.activeTabId ? 'tab-active' : ''}"
+				onclick={() => tabStore.switchTab(tab.id)}
+				onkeydown={(e) => { if (e.key === 'Enter' || e.key === ' ') tabStore.switchTab(tab.id); }}
+				tabindex="0"
+			>
+				<span class="flex items-center gap-1.5">
+					<span class="w-1.5 h-1.5 rounded-full shrink-0 {statusColor(tab.agentStatus)}"></span>
+					<span class="max-w-32 truncate text-xs">{tab.title}</span>
+					<button
+						type="button"
+						class="ml-0.5 text-base-content/30 hover:text-error transition-colors text-xs leading-none"
+						onclick={(e) => { e.stopPropagation(); tabStore.closeTab(tab.id); }}
+						aria-label="Close tab"
+					>
+						x
+					</button>
+				</span>
+			</div>
+		{/each}
+	</div>
+</div>
diff --git a/packages/frontend/src/lib/tabs.svelte.ts b/packages/frontend/src/lib/tabs.svelte.ts
new file mode 100644
index 0000000..9ebfaed
--- /dev/null
+++ b/packages/frontend/src/lib/tabs.svelte.ts
@@ -0,0 +1,455 @@
+import { config } from "./config.js";
+import type { AgentEvent, ChatMessage, ContentSegment, DebugInfo, LogEntry, PermissionPrompt, TaskItem } from "./types.js";
+import { wsClient } from "./ws.svelte.js";
+
+function generateId() {
+	return crypto.randomUUID();
+}
+
+function makeDebugInfo(overrides: Partial<DebugInfo> = {}): DebugInfo {
+	return {
+		timestamp: new Date().toISOString(),
+		connectionStatus: wsClient.connectionStatus,
+		...overrides,
+	};
+}
+
+export interface Tab {
+	id: string;
+	title: string;
+	messages: ChatMessage[];
+	agentStatus: "idle" | "running" | "error";
+	keyId: string | null;
+	modelId: string | null;
+	reasoningEffort: string;
+	currentAssistantId: string | null;
+	tasks: TaskItem[];
+}
+
+function createTabStore() {
+	let tabs: Tab[] = $state([]);
+	let activeTabId: string | null = $state(null);
+	let pendingPermissions: PermissionPrompt[] = $state([]);
+	let permissionLog: LogEntry[] = $state([]);
+	let configReloaded = $state(false);
+	let isConnected = $state(false);
+
+	// Clear any stale listeners from HMR reloads, then register
+	wsClient.clearCallbacks();
+	wsClient.onEvent((event) => {
+		handleEvent(event as AgentEvent & { tabId?: string });
+	});
+
+	$effect.root(() => {
+		$effect(() => {
+			isConnected = wsClient.connectionStatus === "connected";
+		});
+	});
+
+	function getActiveTab(): Tab | undefined {
+		return tabs.find((t) => t.id === activeTabId);
+	}
+
+	function getTabById(id: string): Tab | undefined {
+		return tabs.find((t) => t.id === id);
+	}
+
+	async function createNewTab(): Promise<Tab> {
+		const id = generateId();
+		const title = "New Tab";
+
+		// Create on backend
+		try {
+			await fetch(`${config.apiBase}/tabs`, {
+				method: "POST",
+				headers: { "Content-Type": "application/json" },
+				body: JSON.stringify({ id, title }),
+			});
+		} catch {
+			// Continue even if backend fails — tab works locally
+		}
+
+		const tab: Tab = {
+			id,
+			title,
+			messages: [],
+			agentStatus: "idle",
+			keyId: null,
+			modelId: null,
+			reasoningEffort: "max",
+			currentAssistantId: null,
+			tasks: [],
+		};
+		tabs = [...tabs, tab];
+		activeTabId = id;
+		return tab;
+	}
+
+	function switchTab(id: string): void {
+		if (tabs.some((t) => t.id === id)) {
+			activeTabId = id;
+		}
+	}
+
+	async function closeTab(id: string): Promise<void> {
+		const tab = getTabById(id);
+		if (!tab) return;
+
+		// Archive on backend (also stops any running agent)
+		try {
+			await fetch(`${config.apiBase}/tabs/${id}`, { method: "DELETE" });
+		} catch {
+			// Continue with local removal
+		}
+
+		tabs = tabs.filter((t) => t.id !== id);
+
+		// If we closed the active tab, switch to the last remaining or create a new one
+		if (activeTabId === id) {
+			if (tabs.length > 0) {
+				activeTabId = tabs[tabs.length - 1]!.id;
+			} else {
+				await createNewTab();
+			}
+		}
+	}
+
+	function updateTab(id: string, patch: Partial<Tab>): void {
+		tabs = tabs.map((t) => (t.id === id ? { ...t, ...patch } : t));
+	}
+
+	function ensureAssistantMessage(tabId: string): ChatMessage {
+		const tab = getTabById(tabId);
+		if (!tab) throw new Error(`Tab not found: ${tabId}`);
+
+		if (tab.currentAssistantId) {
+			const existing = tab.messages.find((m) => m.id === tab.currentAssistantId);
+			if (existing) return existing;
+		}
+
+		const id = generateId();
+		const newMsg: ChatMessage = {
+			id,
+			role: "assistant",
+			content: [],
+			thinking: "",
+			isStreaming: true,
+		};
+		updateTab(tabId, {
+			currentAssistantId: id,
+			messages: [...tab.messages, newMsg],
+		});
+		return newMsg;
+	}
+
+	function updateMessages(tabId: string, updater: (msgs: ChatMessage[]) => ChatMessage[]): void {
+		const tab = getTabById(tabId);
+		if (!tab) return;
+		updateTab(tabId, { messages: updater(tab.messages) });
+	}
+
+	function handleEvent(event: AgentEvent & { tabId?: string }): void {
+		const tabId = event.tabId;
+
+		switch (event.type) {
+			case "status": {
+				if (tabId) {
+					updateTab(tabId, { agentStatus: event.status });
+					if (event.status === "idle" || event.status === "error") {
+						updateTab(tabId, { currentAssistantId: null });
+					}
+				}
+				break;
+			}
+			case "reasoning-delta": {
+				if (!tabId) break;
+				ensureAssistantMessage(tabId);
+				const tab = getTabById(tabId);
+				if (!tab) break;
+				updateMessages(tabId, (msgs) =>
+					msgs.map((m) =>
+						m.id === tab.currentAssistantId
+							? { ...m, thinking: (m.thinking ?? "") + event.delta }
+							: m,
+					),
+				);
+				break;
+			}
+			case "text-delta": {
+				if (!tabId) break;
+				ensureAssistantMessage(tabId);
+				const tab2 = getTabById(tabId);
+				if (!tab2) break;
+				updateMessages(tabId, (msgs) =>
+					msgs.map((m) => {
+						if (m.id !== tab2.currentAssistantId) return m;
+						const segments = [...m.content];
+						const last = segments[segments.length - 1];
+						if (last && last.type === "text") {
+							segments[segments.length - 1] = { ...last, text: last.text + event.delta };
+						} else {
+							segments.push({ type: "text", text: event.delta });
+						}
+						return { ...m, content: segments, isStreaming: true };
+					}),
+				);
+				break;
+			}
+			case "tool-call": {
+				if (!tabId) break;
+				ensureAssistantMessage(tabId);
+				const tab3 = getTabById(tabId);
+				if (!tab3) break;
+				updateMessages(tabId, (msgs) =>
+					msgs.map((m) => {
+						if (m.id !== tab3.currentAssistantId) return m;
+						const segments: ContentSegment[] = [
+							...m.content,
+							{
+								type: "tool-call",
+								id: event.toolCall.id,
+								name: event.toolCall.name,
+								arguments: event.toolCall.arguments,
+							},
+						];
+						return { ...m, content: segments };
+					}),
+				);
+				break;
+			}
+			case "tool-result": {
+				if (!tabId) break;
+				const tab4 = getTabById(tabId);
+				if (!tab4) break;
+				updateMessages(tabId, (msgs) =>
+					msgs.map((m) => {
+						if (m.id !== tab4.currentAssistantId) return m;
+						return {
+							...m,
+							content: m.content.map((seg) => {
+								if (seg.type === "tool-call" && seg.id === event.toolResult.toolCallId) {
+									return { ...seg, result: event.toolResult.result, isError: event.toolResult.isError };
+								}
+								return seg;
+							}),
+						};
+					}),
+				);
+				break;
+			}
+			case "done": {
+				if (!tabId) break;
+				const tab5 = getTabById(tabId);
+				if (!tab5) break;
+				updateMessages(tabId, (msgs) =>
+					msgs.map((m) =>
+						m.id === tab5.currentAssistantId ? { ...m, isStreaming: false } : m,
+					),
+				);
+				updateTab(tabId, { currentAssistantId: null });
+				break;
+			}
+			case "error": {
+				if (tabId) {
+					const errMsg: ChatMessage = {
+						id: generateId(),
+						role: "assistant",
+						content: [{ type: "text", text: `Error: ${event.error}` }],
+						isStreaming: false,
+						debugInfo: makeDebugInfo({ error: event.error }),
+					};
+					const tab6 = getTabById(tabId);
+					if (tab6) {
+						updateTab(tabId, {
+							messages: [...tab6.messages, errMsg],
+							currentAssistantId: null,
+							agentStatus: "error",
+						});
+					}
+				}
+				break;
+			}
+			case "permission-prompt": {
+				pendingPermissions = event.pending;
+				break;
+			}
+			case "task-list-update": {
+				if (tabId) {
+					updateTab(tabId, { tasks: event.tasks });
+				}
+				break;
+			}
+			case "config-reload": {
+				configReloaded = true;
+				setTimeout(() => { configReloaded = false; }, 2500);
+				break;
+			}
+			case "shell-output": {
+				if (!tabId) break;
+				const tab7 = getTabById(tabId);
+				if (!tab7) break;
+				updateMessages(tabId, (msgs) =>
+					msgs.map((m) => {
+						if (m.id !== tab7.currentAssistantId) return m;
+						const segments = [...m.content];
+						for (let i = segments.length - 1; i >= 0; i--) {
+							const seg = segments[i];
+							if (seg && seg.type === "tool-call") {
+								segments[i] = {
+									...seg,
+									shellOutput: {
+										stdout: (seg.shellOutput?.stdout ?? "") + (event.stream === "stdout" ? event.data : ""),
+										stderr: (seg.shellOutput?.stderr ?? "") + (event.stream === "stderr" ? event.data : ""),
+									},
+								};
+								break;
+							}
+						}
+						return { ...m, content: segments };
+					}),
+				);
+				break;
+			}
+		}
+	}
+
+	async function sendMessage(text: string): Promise<void> {
+		const tab = getActiveTab();
+		if (!tab) return;
+
+		const userMsg: ChatMessage = {
+			id: generateId(),
+			role: "user",
+			content: [{ type: "text", text }],
+		};
+		updateTab(tab.id, { messages: [...tab.messages, userMsg] });
+
+		// Generate title from first user message
+		if (tab.messages.length === 0 || (tab.messages.length === 1 && tab.title === "New Tab")) {
+			const titleText = text.length > 50 ? text.slice(0, 47) + "..." : text;
+			updateTab(tab.id, { title: titleText });
+			fetch(`${config.apiBase}/tabs/${tab.id}`, {
+				method: "PATCH",
+				headers: { "Content-Type": "application/json" },
+				body: JSON.stringify({ title: titleText }),
+			}).catch(() => {});
+		}
+
+		try {
+			const res = await fetch(`${config.apiBase}/chat`, {
+				method: "POST",
+				headers: { "Content-Type": "application/json" },
+				body: JSON.stringify({
+					tabId: tab.id,
+					message: text,
+					...(tab.keyId ? { keyId: tab.keyId } : {}),
+					...(tab.modelId ? { modelId: tab.modelId } : {}),
+					reasoningEffort: tab.reasoningEffort,
+				}),
+			});
+			if (!res.ok) {
+				const body = await res.text();
+				const errMsg: ChatMessage = {
+					id: generateId(),
+					role: "assistant",
+					content: [{ type: "text", text: `Error: Failed to send message (HTTP ${res.status})` }],
+					isStreaming: false,
+					debugInfo: makeDebugInfo({ error: `HTTP ${res.status}`, httpStatus: res.status, httpBody: body }),
+				};
+				updateTab(tab.id, { messages: [...(getTabById(tab.id)?.messages ?? []), errMsg] });
+			}
+		} catch (err) {
+			const errMsg: ChatMessage = {
+				id: generateId(),
+				role: "assistant",
+				content: [{ type: "text", text: "Error: Could not reach the server" }],
+				isStreaming: false,
+				debugInfo: makeDebugInfo({ error: err instanceof Error ? err.message : String(err) }),
+			};
+			updateTab(tab.id, { messages: [...(getTabById(tab.id)?.messages ?? []), errMsg] });
+		}
+	}
+
+	function changeModel(keyId: string, modelId: string): void {
+		const tab = getActiveTab();
+		if (!tab) return;
+		updateTab(tab.id, { keyId, modelId });
+
+		// Persist to backend
+		fetch(`${config.apiBase}/tabs/${tab.id}`, {
+			method: "PATCH",
+			headers: { "Content-Type": "application/json" },
+			body: JSON.stringify({ keyId, modelId }),
+		}).catch(() => {});
+	}
+
+	function setKey(keyId: string): void {
+		const tab = getActiveTab();
+		if (!tab) return;
+		updateTab(tab.id, { keyId, modelId: null });
+
+		// Persist to backend
+		fetch(`${config.apiBase}/tabs/${tab.id}`, {
+			method: "PATCH",
+			headers: { "Content-Type": "application/json" },
+			body: JSON.stringify({ keyId, modelId: null }),
+		}).catch(() => {});
+	}
+
+	function replyPermission(id: string, reply: "once" | "always" | "reject"): void {
+		if (wsClient.connectionStatus !== "connected") return;
+		const prompt = pendingPermissions.find((p) => p.id === id);
+		wsClient.send({ type: "permission-reply", id, reply });
+		pendingPermissions = pendingPermissions.filter((p) => p.id !== id);
+		if (prompt) {
+			permissionLog = [...permissionLog, {
+				id: generateId(),
+				permission: prompt.permission,
+				patterns: prompt.patterns,
+				action: reply,
+				timestamp: new Date().toISOString(),
+				description: prompt.description,
+			}];
+		}
+	}
+
+	function copyConversation(): string {
+		const tab = getActiveTab();
+		if (!tab) return "";
+		const lines: string[] = ["=== Dispatch Conversation ===", `Tab: ${tab.title}`, `Model: ${tab.modelId ?? "default"}`, ""];
+		for (const msg of tab.messages) {
+			const role = msg.role === "user" ? "User" : msg.role === "system" ? "System" : "Assistant";
+			lines.push(`--- ${role} ---`);
+			if (msg.thinking) lines.push(`  [Thinking]: ${msg.thinking}`);
+			for (const seg of msg.content) {
+				if (seg.type === "text") lines.push(seg.text);
+				else if (seg.type === "tool-call") {
+					lines.push(`  [Tool: ${seg.name}]`);
+					if (seg.result !== undefined) lines.push(`  Result: ${seg.result}`);
+				}
+			}
+			lines.push("");
+		}
+		return lines.join("\n");
+	}
+
+	return {
+		get tabs() { return tabs; },
+		get activeTabId() { return activeTabId; },
+		get activeTab() { return getActiveTab(); },
+		get isConnected() { return isConnected; },
+		get pendingPermissions() { return pendingPermissions; },
+		get permissionLog() { return permissionLog; },
+		get configReloaded() { return configReloaded; },
+		createNewTab,
+		switchTab,
+		closeTab,
+		sendMessage,
+		changeModel,
+		setKey,
+		replyPermission,
+		copyConversation,
+	};
+}
+
+export const tabStore = createTabStore();
diff --git a/packages/frontend/src/lib/ws.svelte.ts b/packages/frontend/src/lib/ws.svelte.ts
index 2ca97be..26f9077 100644
--- a/packages/frontend/src/lib/ws.svelte.ts
+++ b/packages/frontend/src/lib/ws.svelte.ts
@@ -76,6 +76,11 @@ function createWebSocketClient(url: string) {
 		};
 	}
 
+	/** Remove all registered event callbacks (used for HMR safety). */
+	function clearCallbacks() {
+		callbacks.length = 0;
+	}
+
 	function send(data: unknown): void {
 		if (ws && ws.readyState === WebSocket.OPEN) {
 			ws.send(JSON.stringify(data));
@@ -89,6 +94,7 @@ function createWebSocketClient(url: string) {
 		connect,
 		disconnect,
 		onEvent,
+		clearCallbacks,
 		send,
 	};
 }