chore: address code review feedback

Address suggestions from gemini-code-assist and coderabbit-ai:

Logging Improvements:
- Remove excessive debug logging from ClaudeProvider
- Remove sensitive environment variable logging (API key length, HOME, USER)
- Remove verbose per-message stream logging from AgentService
- Remove redundant SDK options logging
- Remove watchdog timer logging (diagnostic tool)

Documentation:
- Update JSDoc example in ClaudeMdSettings to include sandbox props

Persistence Fix:
- Add enableSandboxMode to syncSettingsToServer updates object
- Ensures sandbox setting is properly persisted to server storage

This reduces log volume significantly while maintaining important
error and state transition logging.

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

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

apps/ui/src/components/views/settings-view/claude/claude-md-settings.tsx

@@ -13,14 +13,17 @@ interface ClaudeMdSettingsProps {
 /**
  * ClaudeMdSettings Component
  *
- * UI control for the autoLoadClaudeMd setting which enables automatic loading
- * of project instructions from .claude/CLAUDE.md files via the Claude Agent SDK.
+ * UI controls for Claude Agent SDK settings including:
+ * - Auto-loading of project instructions from .claude/CLAUDE.md files
+ * - Sandbox mode for isolated bash command execution
  *
  * Usage:
  * ```tsx
  * <ClaudeMdSettings
  *   autoLoadClaudeMd={autoLoadClaudeMd}
  *   onAutoLoadClaudeMdChange={setAutoLoadClaudeMd}
+ *   enableSandboxMode={enableSandboxMode}
+ *   onEnableSandboxModeChange={setEnableSandboxMode}
  * />
  * ```
  */