Web UI improvements: mobile responsiveness, chat fixes, themes

Mobile Responsiveness:
- WorkspaceList: card layout on mobile, table on desktop
- WorkspaceDetail: icon-only tabs on mobile, responsive header/toolbar
- SessionListItem: condensed layout, hidden metadata on small screens
- Settings pages: vertical stacking on mobile, larger touch targets (44px)
- Sidebar: increased touch targets for all navigation links
- Layout: responsive padding (px-4/py-6 on mobile, px-6/py-8 on desktop)

Chat UI Fixes:
- Tool calls now show command/file inline when collapsed (Bash, Read, Edit, etc.)
- Tool use and tool result combined into single bubble with Input/Result sections
- Fixed history loading to properly include tool_use/tool_result messages
- Reopening past sessions now correctly displays tool call bubbles

Theme Improvements:
- Fixed light theme contrast issues (Concrete, Blossom, Slate)
- Darkened muted-foreground colors for WCAG AA compliance
- Adjusted warning colors from yellow to deeper orange
- Theme switcher shows "Theme" label with current theme name below

Settings Reorganization:
- Renamed "Coding Agents" to "Configuration"
- Renamed "Credential Files" to "Files"
- Centered all settings pages with max-w-2xl mx-auto
- Updated descriptions to emphasize syncing from host

Backend:
- Auto-sync ~/.gitconfig to workspaces on start (before other credentials)
- Added copyGitConfig() for git author/alias configuration

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: gricha

TODO.md

@@ -16,6 +16,24 @@
 
 ## Tasks
 
+### Credential/File Sync to Existing Workspaces
+
+- [ ] **Add functionality to re-sync files from host to running workspaces**
+  - Currently, credential files (Claude OAuth token, GitHub PAT, SSH keys, etc.) are only copied during workspace creation
+  - When a user updates their host credentials, existing workspaces don't receive the updated files
+  - Need a way to trigger re-sync of configured files from host to container
+  - Potential approaches:
+    - Add a "Sync Files" button in workspace settings UI
+    - Add `workspace sync <name>` CLI command
+    - Automatically sync on workspace start if files have changed (compare mtimes/hashes)
+  - Should sync:
+    - Files configured in Settings > Files (source → dest mappings)
+    - Claude Code credentials (`~/.claude/.credentials.json`)
+    - Codex credentials (`~/.codex/auth.json`, `~/.codex/config.toml`)
+    - GitHub token from agent config (as `GITHUB_TOKEN` env var or gitconfig)
+    - Any custom environment variables from Settings > Environment
+  - Consider showing a "Files outdated" indicator if host files are newer than container copies
+
 ### UI Feedback Round 1
 
 #### Agent Terminal Integration (Research Required)