feat: CLI v2.1.81–v2.1.104 support (#261)

## Summary

Implements support for all Claude Code CLI changes from v2.1.81 through v2.1.104, closing issues #253–#260.

### Changes

- **#253** — New `CwdChanged` hook event: parse and emit `claude:cwd-changed` Tauri event; new `CwdChangedEvent` type
- **#254** — New `FileChanged` hook event: parse and emit `claude:file-changed` Tauri event; new `FileChangedEvent` type
- **#255** — Idle-return prompt: TUI-only feature, not present in `--output-format stream-json` mode — closed as not applicable
- **#256** — New `TaskCreated` and `PermissionDenied` hook events: parse and emit `claude:task-created` / `claude:permission-denied` Tauri events; `PermissionDenied` also triggers `CharacterState::Permission` character animation
- **#257** — Defer permission request: no PreToolUse hook response mechanism in Hikari Desktop — closed as not applicable
- **#258** — `Monitor` tool: added `"Monitor"` to `SEARCH_TOOLS` constant so it maps to `CharacterState::Searching`
- **#259** — `disableSkillShellExecution` setting: wired through `ClaudeStartOptions`, `HikariConfig`, `--settings` JSON, TypeScript interface, and exposed in the Config Sidebar UI
- **#260** — Updated `SUPPORTED_CLI_VERSION` constant from `"2.1.80"` to `"2.1.104"`

All changes pass `check-all.sh` (ESLint → Prettier → svelte-check → Vitest → Clippy → cargo test with llvm-cov).

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #261
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

src-tauri/src/types.rs

@@ -318,6 +318,42 @@ pub struct PostCompactEvent {
     pub conversation_id: Option<String>,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CwdChangedEvent {
+    pub cwd: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub conversation_id: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct FileChangedEvent {
+    pub file: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub conversation_id: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct TaskCreatedEvent {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub task_id: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub description: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub parent_tool_use_id: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub conversation_id: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct PermissionDeniedEvent {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub tool_name: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub reason: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub conversation_id: Option<String>,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct AgentStartEvent {
     pub tool_use_id: String,
@@ -741,4 +777,137 @@ mod tests {
         assert!(serialized.contains("\"session_id\":\"sess-xyz\""));
         assert!(!serialized.contains("conversation_id"));
     }
+
+    #[test]
+    fn test_cwd_changed_event_serialization() {
+        let event = CwdChangedEvent {
+            cwd: "/home/naomi/code/my-project".to_string(),
+            conversation_id: Some("conv-abc".to_string()),
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"cwd\":\"/home/naomi/code/my-project\""));
+        assert!(serialized.contains("\"conversation_id\":\"conv-abc\""));
+    }
+
+    #[test]
+    fn test_cwd_changed_event_omits_none_fields() {
+        let event = CwdChangedEvent {
+            cwd: "/tmp/workspace".to_string(),
+            conversation_id: None,
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"cwd\":\"/tmp/workspace\""));
+        assert!(!serialized.contains("conversation_id"));
+    }
+
+    #[test]
+    fn test_file_changed_event_serialization() {
+        let event = FileChangedEvent {
+            file: "/home/naomi/code/my-project/src/main.rs".to_string(),
+            conversation_id: Some("conv-abc".to_string()),
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"file\":\"/home/naomi/code/my-project/src/main.rs\""));
+        assert!(serialized.contains("\"conversation_id\":\"conv-abc\""));
+    }
+
+    #[test]
+    fn test_file_changed_event_omits_none_fields() {
+        let event = FileChangedEvent {
+            file: "/tmp/test.txt".to_string(),
+            conversation_id: None,
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"file\":\"/tmp/test.txt\""));
+        assert!(!serialized.contains("conversation_id"));
+    }
+
+    #[test]
+    fn test_task_created_event_serialization() {
+        let event = TaskCreatedEvent {
+            task_id: Some("task-abc123".to_string()),
+            description: Some("Explore the codebase".to_string()),
+            parent_tool_use_id: Some("toolu_xyz".to_string()),
+            conversation_id: Some("conv-abc".to_string()),
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"task_id\":\"task-abc123\""));
+        assert!(serialized.contains("\"description\":\"Explore the codebase\""));
+        assert!(serialized.contains("\"parent_tool_use_id\":\"toolu_xyz\""));
+        assert!(serialized.contains("\"conversation_id\":\"conv-abc\""));
+    }
+
+    #[test]
+    fn test_task_created_event_omits_none_fields() {
+        let event = TaskCreatedEvent {
+            task_id: None,
+            description: None,
+            parent_tool_use_id: None,
+            conversation_id: None,
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert_eq!(serialized, "{}");
+    }
+
+    #[test]
+    fn test_task_created_event_partial_fields() {
+        let event = TaskCreatedEvent {
+            task_id: Some("task-001".to_string()),
+            description: None,
+            parent_tool_use_id: None,
+            conversation_id: None,
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"task_id\":\"task-001\""));
+        assert!(!serialized.contains("description"));
+        assert!(!serialized.contains("parent_tool_use_id"));
+        assert!(!serialized.contains("conversation_id"));
+    }
+
+    #[test]
+    fn test_permission_denied_event_serialization() {
+        let event = PermissionDeniedEvent {
+            tool_name: Some("Bash".to_string()),
+            reason: Some("Tool not in allow list".to_string()),
+            conversation_id: Some("conv-abc".to_string()),
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"tool_name\":\"Bash\""));
+        assert!(serialized.contains("\"reason\":\"Tool not in allow list\""));
+        assert!(serialized.contains("\"conversation_id\":\"conv-abc\""));
+    }
+
+    #[test]
+    fn test_permission_denied_event_omits_none_fields() {
+        let event = PermissionDeniedEvent {
+            tool_name: None,
+            reason: None,
+            conversation_id: None,
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert_eq!(serialized, "{}");
+    }
+
+    #[test]
+    fn test_permission_denied_event_partial_fields() {
+        let event = PermissionDeniedEvent {
+            tool_name: Some("Edit".to_string()),
+            reason: None,
+            conversation_id: None,
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"tool_name\":\"Edit\""));
+        assert!(!serialized.contains("reason"));
+        assert!(!serialized.contains("conversation_id"));
+    }
 }