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/config.rs

@@ -25,6 +25,9 @@ pub struct ClaudeStartOptions {
 
     #[serde(default)]
     pub resume_session_id: Option<String>,
+
+    #[serde(default)]
+    pub use_worktree: bool,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -113,6 +116,9 @@ pub struct HikariConfig {
 
     #[serde(default = "default_discord_rpc_enabled")]
     pub discord_rpc_enabled: bool,
+
+    #[serde(default)]
+    pub use_worktree: bool,
 }
 
 impl Default for HikariConfig {
@@ -145,6 +151,7 @@ impl Default for HikariConfig {
             budget_action: BudgetAction::Warn,
             budget_warning_threshold: 0.8,
             discord_rpc_enabled: true,
+            use_worktree: false,
         }
     }
 }
@@ -284,6 +291,7 @@ mod tests {
             budget_action: BudgetAction::Block,
             budget_warning_threshold: 0.75,
             discord_rpc_enabled: true,
+            use_worktree: true,
         };
 
         let json = serde_json::to_string(&config).unwrap();