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/src/ChatViewProvider.ts

@@ -5,6 +5,7 @@ import type { OpenCodeManager, ConnectionStatus } from './opencode';
 import { getWebviewShikiThemes } from './shikiThemes';
 import { getWebviewHtml } from './webviewHtml';
 import { openSseProxy } from './sseProxy';
+import { resolveWebviewDevServerUrl } from './webviewDevServer';
 
 export class ChatViewProvider implements vscode.WebviewViewProvider {
   public static readonly viewType = 'openchamber.chatView';
@@ -20,12 +21,15 @@ export class ChatViewProvider implements vscode.WebviewViewProvider {
   private _cachedError?: string;
   private _sseCounter = 0;
   private _sseStreams = new Map<string, AbortController>();
+  private readonly _webviewDevServerUrl: string | null;
 
   constructor(
     private readonly _context: vscode.ExtensionContext,
     private readonly _extensionUri: vscode.Uri,
     private readonly _openCodeManager?: OpenCodeManager
-  ) {}
+  ) {
+    this._webviewDevServerUrl = resolveWebviewDevServerUrl(this._context);
+  }
 
   public resolveWebviewView(
     webviewView: vscode.WebviewView
@@ -110,6 +114,27 @@ export class ChatViewProvider implements vscode.WebviewViewProvider {
     }
   }
 
+  public addFileMentions(paths: string[]) {
+    if (!this._view) {
+      return;
+    }
+
+    const cleanedPaths = paths
+      .map((entry) => entry.trim())
+      .filter((entry) => entry.length > 0);
+
+    if (cleanedPaths.length === 0) {
+      return;
+    }
+
+    this._view.show(true);
+    this._view.webview.postMessage({
+      type: 'command',
+      command: 'addFileMentions',
+      payload: { paths: cleanedPaths },
+    });
+  }
+
   public createNewSessionWithPrompt(prompt: string) {
     if (this._view) {
       // Reveal the webview panel
@@ -277,6 +302,7 @@ export class ChatViewProvider implements vscode.WebviewViewProvider {
       workspaceFolder,
       initialStatus,
       cliAvailable,
+      devServerUrl: this._webviewDevServerUrl,
     });
   }
 }