feat: add worktree isolation support and hook event display

Closes #152, closes #150

- Add use_worktree bool to ClaudeStartOptions and HikariConfig (Rust + TS)
- Pass --worktree flag to claude in both WSL and non-WSL command paths
- Detect WorktreeCreate/WorktreeRemove hook events in stderr handler
- Emit worktree events with distinct line_type instead of error
- Add worktree line type to TerminalLine union, Terminal rendering, and tests
- Display worktree events in green with [worktree] prefix
- Add worktree isolation toggle to Agent Settings section of ConfigSidebar
- Thread use_worktree through all seven start_claude call sites

src-tauri/src/wsl_bridge.rs

@@ -265,6 +265,11 @@ impl WslBridge {
                 }
             }
 
+            // Add worktree flag if requested
+            if options.use_worktree {
+                cmd.arg("--worktree");
+            }
+
             cmd.current_dir(working_dir);
 
             // Set API key as environment variable if specified
@@ -351,6 +356,11 @@ impl WslBridge {
                 }
             }
 
+            // Add worktree flag if requested
+            if options.use_worktree {
+                claude_cmd.push_str(" --worktree");
+            }
+
             // Use bash -lc to load login profile (ensures PATH includes claude)
             cmd.args(["-e", "bash", "-lc", &claude_cmd]);
 
@@ -751,11 +761,18 @@ fn handle_stderr(
                     }
                 }
 
-                // Still emit the stderr line as output
+                // Worktree hook events are informational — emit with a distinct type
+                let is_worktree_event = line.contains("[WorktreeCreate Hook]")
+                    || line.contains("[WorktreeRemove Hook]");
+
                 let _ = app.emit(
                     "claude:output",
                     OutputEvent {
-                        line_type: "error".to_string(),
+                        line_type: if is_worktree_event {
+                            "worktree".to_string()
+                        } else {
+                            "error".to_string()
+                        },
                         content: line,
                         tool_name: None,
                         conversation_id: conversation_id.clone(),