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/package.json

@@ -35,6 +35,7 @@
   "main": "./dist/extension.js",
   "activationEvents": [
     "onCommand:openchamber.openSidebar",
+    "onCommand:openchamber.attachExplorerToChat",
     "onView:openchamber.chatView"
   ],
   "contributes": {
@@ -134,6 +135,11 @@
         "category": "OpenChamber",
         "title": "Settings",
         "icon": "$(settings-gear)"
+      },
+      {
+        "command": "openchamber.attachExplorerToChat",
+        "category": "OpenChamber",
+        "title": "Attach to OpenChamber Chat"
       }
     ],
     "submenus": [
@@ -149,6 +155,13 @@
           "group": "navigation"
         }
       ],
+      "explorer/context": [
+        {
+          "command": "openchamber.attachExplorerToChat",
+          "when": "resourceScheme == file && explorerResourceIsFolder == false",
+          "group": "navigation@50"
+        }
+      ],
       "editor/title": [
         {
           "command": "openchamber.openNewSessionInEditor",
@@ -210,7 +223,8 @@
     "build": "bun run build:extension && bun run build:webview",
     "build:extension": "esbuild src/extension.ts --bundle --outfile=dist/extension.js --external:vscode --format=cjs --platform=node --minify --main-fields=module,main",
     "build:webview": "VITE_OPENCODE_URL=/api vite build",
-    "dev": "concurrently -n \"ext,web\" -c \"cyan,magenta\" \"bun run watch:extension\" \"bun run watch:webview\"",
+    "dev": "concurrently -n \"ext,web\" -c \"cyan,magenta\" \"bun run watch:extension\" \"bun run dev:webview\"",
+    "dev:webview": "vite --host localhost --port 5173 --strictPort",
     "watch:extension": "esbuild src/extension.ts --bundle --outfile=dist/extension.js --external:vscode --format=cjs --platform=node --watch --sourcemap --main-fields=module,main",
     "watch:webview": "vite build --watch",
     "type-check": "tsc --noEmit -p tsconfig.json && tsc --noEmit -p tsconfig.webview.json",
@@ -229,7 +243,7 @@
   },
   "dependencies": {
     "@openchamber/ui": "workspace:*",
-    "@opencode-ai/sdk": "^1.2.27",
+    "@opencode-ai/sdk": "^1.3.0",
     "adm-zip": "^0.5.16",
     "jsonc-parser": "^3.3.1",
     "react": "^19.1.1",