Major UI refresh: sidebar redesign, theme expansion, and chat performance optimizations (#706)

## Summary
Complete sidebar redesign and comprehensive UI polish pass with performance optimizations, theme system refinements, and desktop integration improvements.

## Key Changes

**Sidebar & Navigation Redesign**
- Redesigned sessions sidebar layout with unified button primitives
- Added activity sections with project grouping and improved session organization
- Refined sidebar corners, spacing, and visual hierarchy
- Removed NavRail component in favor of streamlined sidebar
- Stabilized sessions bar toggle position in fullscreen mode

**Performance Optimizations**
- Reduced chat streaming CPU usage and storage churn
- Optimized task tool polling and live timers with debouncing
- Prevented chat state races and reduced background request load
- Debounced draft writes and coalesced session reloads
- Optimized message store updates and turn tracking

**Theme & Visual System**
- Added theme-aware window corners (desktop) and border radius tokens
- Introduced glassmorphism effects on desktop sidebar
- Added backdrop blur to UI elements

**Chat Experience**
- Added session-based permission auto-accept toggle in chat input
- Polished permission shield UX with improved icon sizing and spacing
- Fixed chat scroll-to-bottom behavior and timeline tracking
- Enhanced tool output display with better path label detection
- Removed duplicate draft context details in chat header
- Added text selection menu to chat messages

**Git Improvements**
- Refreshed git history visual design with cleaner dividers
- Added remote removal action in sync selector
- Stabilized git polling to prevent excessive requests
- Improved tool output rendering for git operations

**Settings & Panels**
- Fixed mobile scrolling on settings pages
- Made outside-click settings close instantly
- Reduced settings load churn and CPU spikes
- Improved services dropdown layout and spacing
- Softened panel resize handles

**Desktop Integration**
- Synced macOS window theme with app theme
- Restored window dragging in sidebar header zones
- Fixed system window corners on macOS
- Improved header session metadata and action controls

**Button & Component Standardization**
- Unified button primitives across all components
- Standardized destructive action patterns
- Removed unused button variants (button-large, button-small)
- Aligned context tab close hit areas

---------

Co-authored-by: Iuliia Ivashko <yulia.ivashko@gmail.com>

packages/web/server/index.js

@@ -12157,6 +12157,27 @@ async function main(options = {}) {
     }
   });
 
+  app.delete('/api/git/remotes', async (req, res) => {
+    const { removeRemote } = await getGitLibraries();
+    try {
+      const directory = req.query.directory;
+      if (!directory) {
+        return res.status(400).json({ error: 'directory parameter is required' });
+      }
+
+      const remote = String(req.body?.remote || '').trim();
+      if (!remote) {
+        return res.status(400).json({ error: 'remote is required' });
+      }
+
+      const result = await removeRemote(directory, { remote });
+      res.json(result);
+    } catch (error) {
+      console.error('Failed to remove remote:', error);
+      res.status(500).json({ error: error.message || 'Failed to remove remote' });
+    }
+  });
+
   app.post('/api/git/rebase', async (req, res) => {
     const { rebase } = await getGitLibraries();
     try {

packages/web/server/lib/git/DOCUMENTATION.md

@@ -51,6 +51,7 @@ The following functions are exported and used by the web server:
 - `pull(directory, options)`: Pull changes from remote.
 - `push(directory, options)`: Push changes to remote (auto-sets upstream if needed).
 - `fetch(directory, options)`: Fetch changes from remote.
+- `removeRemote(directory, options)`: Remove a configured remote (except `origin`).
 - `deleteRemoteBranch(directory, options)`: Delete a remote branch.
 
 ### Log Operations

packages/web/server/lib/git/service.js

@@ -2692,6 +2692,26 @@ export async function getRemotes(directory) {
   }
 }
 
+export async function removeRemote(directory, options = {}) {
+  const remoteName = String(options.remote || '').trim();
+  if (!remoteName) {
+    throw new Error('remote is required to remove a remote');
+  }
+  if (remoteName === 'origin') {
+    throw new Error('Cannot remove origin remote');
+  }
+
+  const git = await createGit(directory);
+
+  try {
+    await git.removeRemote(remoteName);
+    return { success: true };
+  } catch (error) {
+    console.error('Failed to remove remote:', error);
+    throw error;
+  }
+}
+
 export async function rebase(directory, options = {}) {
   const git = await createGit(directory);