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/ui/src/components/chat/FileAttachment.tsx

@@ -20,24 +20,15 @@ export const FileAttachmentButton = memo(() => {
   const iconSizeClass = isMobile ? 'h-5 w-5' : 'h-[18px] w-[18px]';
 
   const attachFiles = async (files: FileList | File[]) => {
-    let attachedCount = 0;
     for (let i = 0; i < files.length; i++) {
       const file = files[i];
-      const sizeBefore = useSessionStore.getState().attachedFiles.length;
       try {
         await addAttachedFile(file);
-        const sizeAfter = useSessionStore.getState().attachedFiles.length;
-        if (sizeAfter > sizeBefore) {
-          attachedCount++;
-        }
       } catch (error) {
         console.error('File attach failed', error);
         toast.error(error instanceof Error ? error.message : 'Failed to attach file');
       }
     }
-    if (attachedCount > 0) {
-      toast.success(`Attached ${attachedCount} file${attachedCount > 1 ? 's' : ''}`);
-    }
   };
 
   const handleFileSelect = async (e: React.ChangeEvent<HTMLInputElement>) => {