feat: agent builder, CWD support, auto-save, UI polish, unavailable tool handling

- Agent Builder: full CRUD with card grid, drag-and-drop model reorder, edit/delete
- Auto-save on edit with 600ms debounce, AbortController for concurrency, fieldset disabled until name entered
- Agent definitions stored as TOML with cwd field, loaded from global/project dirs
- Working directory: per-tab CWD override in Chat Settings, agent default CWD, auto-create on first message
- CWD validation: check-dir endpoint with ~ expansion, real-time validity indicator
- Subagent CWD validated against parent's effective CWD using path.relative
- Unavailable tool calls: caught gracefully, shown as tool call with error badge, model retries
- UI: tab bar border radius, sidebar border removed, chat input ghost style, scroll-to-bottom rectangle
- Skills dir collapse uses CSS rotation, Model Choice renamed to Chat Settings, System Prompt view removed
- Reusable SkillsBrowser/ToolPermissions with external mode for Agent Builder
- ModelSelector: Agent/Manual toggle, agent list, Agent Settings link
- Page router, skills recursive scanning, bin/up gopass removed, docker volume mounts

1 files changed, 6 insertions, 2 deletions

diff --git a/packages/api/src/index.ts b/packages/api/src/index.ts
index a05f800..045196b 100644
--- a/packages/api/src/index.ts
+++ b/packages/api/src/index.ts
@@ -1,6 +1,6 @@
+import type { PermissionReply } from "@dispatch/core";
 import { createBunWebSocket } from "hono/bun";
 import { agentManager, app, permissionManager } from "./app.js";
-import type { PermissionReply } from "@dispatch/core";
 
 const { upgradeWebSocket, websocket } = createBunWebSocket();
 
@@ -41,7 +41,11 @@ app.get(
 						id?: string;
 						reply?: string;
 					};
-					if (message.type === "permission-reply" && typeof message.id === "string" && typeof message.reply === "string") {
+					if (
+						message.type === "permission-reply" &&
+						typeof message.id === "string" &&
+						typeof message.reply === "string"
+					) {
 						const validReplies: PermissionReply[] = ["once", "always", "reject"];
 						if (validReplies.includes(message.reply as PermissionReply)) {
 							permissionManager.reply(message.id, message.reply as PermissionReply);