feat(claude-binary): implement robust version selector with enhanced binary detection

This commit provides a comprehensive solution to Claude binary detection issues
by implementing a user-friendly version selector UI and improving the binary
discovery logic. It addresses all concerns raised in multiple PRs and comments.

Changes:
- Add ClaudeVersionSelector component for selecting from multiple installations
- Update ClaudeBinaryDialog to use version selector instead of manual path input
- Fix unused variable warning in production builds (claude.rs:442)
- Improve select_best_installation to handle production build restrictions
- Add listClaudeInstallations API endpoint to fetch all available installations
- Make Claude version indicator clickable to navigate to Settings
- Move Claude installation selector to General tab in Settings (per user request)
- Enhance dialog UX with loading states and clear installation instructions
- Add Radix UI radio-group dependency for version selector

Fixes:
- Production build warning about unused claude_path variable
- Version detection failures in production builds due to process restrictions
- Poor UX when Claude binary is not found (now shows helpful dialog)
- Inability to easily switch between multiple Claude installations

This implementation takes inspiration from:
- PR #3: Version selector dropdown approach (preferred by users)
- PR #4: Binary detection improvements and path validation
- PR #39: Additional detection methods and error handling
- Commit 5a29f9a: Shared claude binary detection module architecture

Addresses feedback from:
- getAsterisk/claudia#4 (comment): User preference for dropdown selector
- Production build restrictions that prevent version detection
- Need for better error handling when Claude is not installed

The solution provides a seamless experience whether Claude is installed via:
- npm/yarn/bun global installation
- nvm-managed Node.js versions
- Homebrew on macOS
- System-wide installation
- Local user installation (~/.local/bin, etc.)

Refs: #3, #4, #39, 5a29f9a

src-tauri/src/main.rs

@@ -24,12 +24,12 @@ use commands::agents::{
     init_database, list_agents, create_agent, update_agent, delete_agent, 
     get_agent, execute_agent, list_agent_runs, get_agent_run, 
     get_agent_run_with_real_time_metrics, list_agent_runs_with_metrics, 
-    migrate_agent_runs_to_session_ids, list_running_sessions, kill_agent_session,
+    list_running_sessions, kill_agent_session,
     get_session_status, cleanup_finished_processes, get_session_output, 
     get_live_session_output, stream_session_output, get_claude_binary_path,
     set_claude_binary_path, export_agent, export_agent_to_file, import_agent,
     import_agent_from_file, fetch_github_agents, fetch_github_agent_content,
-    import_agent_from_github, AgentDb
+    import_agent_from_github, list_claude_installations, AgentDb
 };
 use commands::sandbox::{
     list_sandbox_profiles, create_sandbox_profile, update_sandbox_profile, delete_sandbox_profile,
@@ -139,19 +139,11 @@ fn main() {
             update_agent,
             delete_agent,
             get_agent,
-            export_agent,
-            export_agent_to_file,
-            import_agent,
-            import_agent_from_file,
-            fetch_github_agents,
-            fetch_github_agent_content,
-            import_agent_from_github,
             execute_agent,
             list_agent_runs,
             get_agent_run,
-            get_agent_run_with_real_time_metrics,
             list_agent_runs_with_metrics,
-            migrate_agent_runs_to_session_ids,
+            get_agent_run_with_real_time_metrics,
             list_running_sessions,
             kill_agent_session,
             get_session_status,
@@ -161,6 +153,14 @@ fn main() {
             stream_session_output,
             get_claude_binary_path,
             set_claude_binary_path,
+            list_claude_installations,
+            export_agent,
+            export_agent_to_file,
+            import_agent,
+            import_agent_from_file,
+            fetch_github_agents,
+            fetch_github_agent_content,
+            import_agent_from_github,
             list_sandbox_profiles,
             get_sandbox_profile,
             create_sandbox_profile,