feat: improve VS Code dev flow and stabilize sidebar/chat behavior (#754)

* fix: improve session sidebar tooltip and truncation behavior

- Keep new-draft tooltip anchored to its trigger button
- Fix minimal-mode worktree/group header text truncation
- Tune minimal-mode right padding to reduce early label clipping

* fix: render reasoning through markdown pipeline

- Use Streamdown rendering for reasoning in live chat mode
- Remove italic styling from reasoning text
- Render expanded reasoning content with MarkdownRenderer

* chore: remove legacy electron dependencies

- Removed unused Electron packages from root and UI manifests
- Deleted obsolete Electron context menu type declaration
- Regenerated lockfile after dependency cleanup

* fix: handle non-repository folders in git status API

- Prevent 500 errors when status is requested outside a valid Git repo
- Improve repository detection using `git rev-parse --git-dir`
- Reduce noisy server logs for expected non-repo status checks

* fix unloaded session chat layout flicker

* fix: reduce noisy TTS status polling

Cache and dedupe TTS status requests, and only check provider availability when the related voice features are enabled so disabled voice setups stay quiet.

* perf: throttle background PR git status refreshes

* fix: improve VS Code Explorer file drop mentions in chat

- Add Explorer context action to insert selected files as @mentions.
- Handle Explorer drag-and-drop to prefill @file mentions instead of attachments.
- Prevent duplicate plain-path text when dropping multiple files.

* fix: deduplicate recent sessions in VS Code sidebar

- Hide sessions from main list when already shown in recent
- Apply dedup only in VS Code runtime
- Keep session search behavior unchanged

* feat: add true HMR dev flow for VS Code extension

- Load VS Code webview from Vite dev server with React refresh preamble
- Add `vscode:dev` runner that starts watchers and opens Extension Development Host
- Update VS Code dev docs and scripts to use the new HMR startup flow

* feat: polish VS Code session sidebar and attachment UX

- Add resizable sessions sidebar in VS Code layout
- Tighten session list spacing and hover behavior in VS Code
- Remove bulk file/image attach success toasts while keeping error toasts

packages/vscode/vite.config.ts

@@ -5,7 +5,7 @@ import { fileURLToPath } from 'node:url';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
-export default defineConfig({
+export default defineConfig(({ mode }) => ({
   root: path.resolve(__dirname, 'webview'),
   base: './',  // Use relative paths for VS Code webview
   plugins: [
@@ -27,11 +27,25 @@ export default defineConfig({
     format: 'es',
   },
   define: {
-    'process.env.NODE_ENV': JSON.stringify('production'),
+    'process.env.NODE_ENV': JSON.stringify(mode === 'production' ? 'production' : 'development'),
     'global': 'globalThis',
     '__OPENCHAMBER_WEBVIEW_BUILD_TIME__': JSON.stringify(new Date().toISOString()),
   },
   envPrefix: ['VITE_'],
+  server: {
+    host: 'localhost',
+    port: 5173,
+    strictPort: true,
+    cors: true,
+    headers: {
+      'Access-Control-Allow-Origin': '*',
+    },
+    hmr: {
+      host: 'localhost',
+      protocol: 'ws',
+      port: 5173,
+    },
+  },
   optimizeDeps: {
     include: ['@opencode-ai/sdk/v2'],
   },
@@ -48,4 +62,4 @@ export default defineConfig({
       },
     },
   },
-});
+}));