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)

1 files changed, 3 insertions, 3 deletions

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>