refactor(desktop): make Tauri thin shell running web sidecar (#273)

## What / Why
This PR finishes the desktop refactor: the Tauri app is now a thin shell that launches the web server as a sidecar and loads the UI from `http://127.0.0.1:<port>`. All real backend logic lives in `packages/web/server/index.js`; desktop Rust keeps only native integrations (menu/dialog/notifications/updater/deep-link + window chrome).
This unblocks:
- consistent behavior across web/desktop/vscode (single backend)
- simpler desktop maintenance (no duplicated Rust backend)
- host switching between Local + remote instances in desktop
- reliable cold-start behavior on slow machines (VSCode + desktop)
## Key changes
- Desktop sidecar runtime
  - build pipeline to bundle web dist + `openchamber-server` sidecar (`packages/desktop/scripts/build-sidecar.mjs`)
  - robust local port selection (prefer saved/default, fallback to random; persisted in `~/.config/openchamber/settings.json`)
  - improved PATH handling so the sidecar can locate `opencode` CLI (incl `~/.opencode/bin`, overrides, common bins)
  - disable native right-click context menu in production builds (dev keeps it)
- Desktop instance switcher (Tauri-only)
  - header button + modal to add/edit/delete remote hosts, set default, probe status/ping, switch back to Local escape hatch
  - auth gate includes host switcher so you can recover when a remote host is broken/auth-required
  - host list stored desktop-locally (not tied to the currently selected remote server)
- Notifications
  - decision logic moved server-side; desktop notifications emitted via sidecar stdout and shown natively by Tauri
  - prevent double-notifications on desktop Local origin (UI ignores SSE notification when native path is active)
  - restore macOS notification sound
- Updates
  - Tauri updater used only when viewing Local instance in desktop shell (avoid “remote web update” triggering desktop restart)
- Settings persistence & UX polish
  - persist model favorites/recents via `/api/config/settings` (works for web + desktop; not origin-dependent)
  - persist per-project sidebar collapse state in `projects[].sidebarCollapsed` via `/api/config/settings` (with debounce on toggles)
  - macOS header sizing/traffic-lights offsets fixed (marketing macOS major injected from desktop; MultiRun header aligned)
  - VSCode cold-start: keep retrying provider/agent loads after connection to avoid empty UI on slow machines
  - misc lint/type fixes + bun.lock sync
- Desktop bootstrap / resiliency
  - show onboarding screen when OpenCode CLI is missing (desktop Local origin), with retry hook to restart OpenCode after install
## Testing notes
- Desktop (macOS): switch Local <-> remote, set default host, verify auth gate recovery, native notifications (with sound), updater gated to Local
- Web: favorites/recents + per-project collapsed state persist across reload/restart
- VSCode: slow startup no longer results in missing providers/agents/models

packages/ui/src/hooks/useKeyboardShortcuts.ts

@@ -3,11 +3,11 @@ import { useSessionStore } from '@/stores/useSessionStore';
 import { useUIStore } from '@/stores/useUIStore';
 import { useThemeSystem } from '@/contexts/useThemeSystem';
 import { useAssistantStatus } from '@/hooks/useAssistantStatus';
-import { getRegisteredRuntimeAPIs } from '@/contexts/runtimeAPIRegistry';
 import { hasModifier } from '@/lib/utils';
 import { createWorktreeSession } from '@/lib/worktreeSessionCreator';
 import { useConfigStore } from '@/stores/useConfigStore';
 import { isVSCodeRuntime } from '@/lib/desktop';
+import { showOpenCodeStatus } from '@/lib/openCodeStatus';
 
 export const useKeyboardShortcuts = () => {
   const { openNewSessionDraft, abortCurrentOperation, armAbortPrompt, clearAbortPrompt, currentSessionId } = useSessionStore();
@@ -24,7 +24,6 @@ export const useKeyboardShortcuts = () => {
   const { working } = useAssistantStatus();
   const abortPrimedUntilRef = React.useRef<number | null>(null);
   const abortPrimedTimeoutRef = React.useRef<ReturnType<typeof setTimeout> | null>(null);
-  const isDownloadingLogsRef = React.useRef(false);
 
   const resetAbortPriming = React.useCallback(() => {
     if (abortPrimedTimeoutRef.current) {
@@ -44,35 +43,8 @@ export const useKeyboardShortcuts = () => {
       }
 
       if (hasModifier(e) && e.shiftKey && e.key.toLowerCase() === 'l') {
-        const runtimeAPIs = getRegisteredRuntimeAPIs();
-        const diagnostics = runtimeAPIs?.diagnostics;
-        if (!diagnostics) {
-          return;
-        }
-
         e.preventDefault();
-        if (isDownloadingLogsRef.current) {
-          return;
-        }
-        isDownloadingLogsRef.current = true;
-
-        diagnostics
-          .downloadLogs()
-          .then(({ fileName, content }) => {
-            const finalFileName = fileName || 'openchamber.log';
-            const blob = new Blob([content], { type: 'text/plain;charset=utf-8' });
-            const url = URL.createObjectURL(blob);
-            const anchor = document.createElement('a');
-            anchor.href = url;
-            anchor.download = finalFileName;
-            document.body.appendChild(anchor);
-            anchor.click();
-            document.body.removeChild(anchor);
-            URL.revokeObjectURL(url);
-          })
-          .finally(() => {
-            isDownloadingLogsRef.current = false;
-          });
+        void showOpenCodeStatus();
         return;
       }