feat: add AskUserQuestion tool support (#60)

## Summary

Implements support for Claude's `AskUserQuestion` tool, allowing Claude to ask the user questions with multiple choice options during a conversation.

## Changes

- Add `UserQuestionEvent` and `QuestionOption` types (Rust and TypeScript)
- Detect `AskUserQuestion` in permission denials and emit `claude:question` event
- Create `UserQuestionModal` component with option selection and custom answer input
- Use stop/reconnect approach (same as `PermissionModal`) since Claude API doesn't accept tool_result for permission-denied tools
- Add `pendingQuestion` to conversation store and `hasQuestionPending` derived store

## Technical Notes

We discovered that Claude Code's permission denial system doesn't allow sending tool results back directly - the API rejects them with "unexpected tool_use_id found in tool_result blocks". The solution was to use the same stop/reconnect pattern that permissions use: stop the session, reconnect with context, and include the user's answer in the context restoration message.

## Test Plan

- [x] Build compiles without errors (Rust + TypeScript)
- [x] Question modal appears when Claude uses `AskUserQuestion`
- [x] Can select options and submit answer
- [x] Answer is properly restored to Claude after reconnect

Closes #51

---

✨ This PR was created with help from Hikari~ 🌸

Co-authored-by: Hikari <hikari@nhcarrigan.com>
Reviewed-on: #60

src-tauri/src/bridge_manager.rs

@@ -79,6 +79,14 @@ impl BridgeManager {
         }
     }
 
+    pub fn send_tool_result(&mut self, conversation_id: &str, tool_use_id: &str, result: serde_json::Value) -> Result<(), String> {
+        if let Some(bridge) = self.bridges.get_mut(conversation_id) {
+            bridge.send_tool_result(tool_use_id, result)
+        } else {
+            Err("No Claude instance found for this conversation".to_string())
+        }
+    }
+
     pub fn is_claude_running(&self, conversation_id: &str) -> bool {
         self.bridges.get(conversation_id)
             .map(|b| b.is_running())

src-tauri/src/commands.rs

@@ -169,3 +169,14 @@ pub async fn load_saved_achievements(app: AppHandle) -> Result<Vec<AchievementUn
 
     Ok(events)
 }
+
+#[tauri::command]
+pub async fn answer_question(
+    bridge_manager: State<'_, SharedBridgeManager>,
+    conversation_id: String,
+    tool_use_id: String,
+    answers: serde_json::Value,
+) -> Result<(), String> {
+    let mut manager = bridge_manager.lock();
+    manager.send_tool_result(&conversation_id, &tool_use_id, answers)
+}

src-tauri/src/lib.rs

@@ -47,6 +47,7 @@ pub fn run() {
             save_config,
             get_usage_stats,
             load_saved_achievements,
+            answer_question,
             send_windows_notification,
             send_simple_notification,
             send_windows_toast,

src-tauri/src/types.rs

@@ -216,6 +216,24 @@ pub struct WorkingDirectoryEvent {
     pub conversation_id: Option<String>,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct QuestionOption {
+    pub label: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub description: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct UserQuestionEvent {
+    pub id: String,
+    pub question: String,
+    pub header: Option<String>,
+    pub options: Vec<QuestionOption>,
+    pub multi_select: bool,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub conversation_id: Option<String>,
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

src-tauri/src/wsl_bridge.rs

@@ -11,7 +11,7 @@ use std::os::windows::process::CommandExt;
 use crate::config::ClaudeStartOptions;
 use crate::stats::{UsageStats, StatsUpdateEvent};
 use parking_lot::RwLock;
-use crate::types::{CharacterState, ClaudeMessage, ConnectionStatus, ContentBlock, StateChangeEvent, OutputEvent, PermissionPromptEvent, ConnectionEvent, SessionEvent, WorkingDirectoryEvent};
+use crate::types::{CharacterState, ClaudeMessage, ConnectionStatus, ContentBlock, StateChangeEvent, OutputEvent, PermissionPromptEvent, ConnectionEvent, SessionEvent, WorkingDirectoryEvent, UserQuestionEvent, QuestionOption};
 use crate::achievements::{get_achievement_info, AchievementUnlockedEvent};
 
 const SEARCH_TOOLS: [&str; 5] = ["Read", "Glob", "Grep", "WebSearch", "WebFetch"];
@@ -350,6 +350,35 @@ impl WslBridge {
         Ok(())
     }
 
+    pub fn send_tool_result(&mut self, tool_use_id: &str, result: serde_json::Value) -> Result<(), String> {
+        let stdin = self.stdin.as_mut().ok_or("Process not running")?;
+
+        // The content should be a JSON string representation of the result
+        let content_str = serde_json::to_string(&result).map_err(|e| e.to_string())?;
+
+        let input = serde_json::json!({
+            "type": "user",
+            "message": {
+                "role": "user",
+                "content": [{
+                    "type": "tool_result",
+                    "tool_use_id": tool_use_id,
+                    "content": content_str
+                }]
+            }
+        });
+
+        let json_line = serde_json::to_string(&input).map_err(|e| e.to_string())?;
+
+        stdin
+            .write_all(format!("{}\n", json_line).as_bytes())
+            .map_err(|e| format!("Failed to write to stdin: {}", e))?;
+
+        stdin.flush().map_err(|e| format!("Failed to flush stdin: {}", e))?;
+
+        Ok(())
+    }
+
     pub fn interrupt(&mut self, app: &AppHandle) -> Result<(), String> {
         // Due to persistent bug in Claude Code where ESC/Ctrl+C doesn't work,
         // we have to kill the process. This is the only reliable way to stop it.
@@ -640,19 +669,68 @@ fn process_json_line(line: &str, app: &AppHandle, stats: &Arc<RwLock<UsageStats>
 
             // Check for permission denials and emit prompts for each
             if let Some(denials) = permission_denials {
+                let mut has_regular_denials = false;
+
                 for denial in denials {
-                    let description = format_tool_description(&denial.tool_name, &denial.tool_input);
-                    let _ = app.emit("claude:permission", PermissionPromptEvent {
-                        id: denial.tool_use_id.clone(),
-                        tool_name: denial.tool_name.clone(),
-                        tool_input: denial.tool_input.clone(),
-                        description,
-                        conversation_id: conversation_id.clone(),
-                    });
+                    // Special handling for AskUserQuestion tool
+                    if denial.tool_name == "AskUserQuestion" {
+                        if let Some(questions) = denial.tool_input.get("questions").and_then(|q| q.as_array()) {
+                            // For now, handle the first question (most common case)
+                            if let Some(first_question) = questions.first() {
+                                let question_text = first_question.get("question")
+                                    .and_then(|q| q.as_str())
+                                    .unwrap_or("Claude has a question for you")
+                                    .to_string();
+
+                                let header = first_question.get("header")
+                                    .and_then(|h| h.as_str())
+                                    .map(|s| s.to_string());
+
+                                let multi_select = first_question.get("multiSelect")
+                                    .and_then(|m| m.as_bool())
+                                    .unwrap_or(false);
+
+                                let options: Vec<QuestionOption> = first_question.get("options")
+                                    .and_then(|opts| opts.as_array())
+                                    .map(|opts| {
+                                        opts.iter().filter_map(|opt| {
+                                            let label = opt.get("label").and_then(|l| l.as_str())?;
+                                            let description = opt.get("description")
+                                                .and_then(|d| d.as_str())
+                                                .map(|s| s.to_string());
+                                            Some(QuestionOption {
+                                                label: label.to_string(),
+                                                description,
+                                            })
+                                        }).collect()
+                                    })
+                                    .unwrap_or_default();
+
+                                let _ = app.emit("claude:question", UserQuestionEvent {
+                                    id: denial.tool_use_id.clone(),
+                                    question: question_text,
+                                    header,
+                                    options,
+                                    multi_select,
+                                    conversation_id: conversation_id.clone(),
+                                });
+                            }
+                        }
+                    } else {
+                        has_regular_denials = true;
+                        let description = format_tool_description(&denial.tool_name, &denial.tool_input);
+                        let _ = app.emit("claude:permission", PermissionPromptEvent {
+                            id: denial.tool_use_id.clone(),
+                            tool_name: denial.tool_name.clone(),
+                            tool_input: denial.tool_input.clone(),
+                            description,
+                            conversation_id: conversation_id.clone(),
+                        });
+                    }
                 }
 
-                // Show permission state if there were denials
-                if !denials.is_empty() {
+                // Show permission state if there were any denials (questions or regular)
+                if has_regular_denials || !denials.is_empty() {
                     emit_state_change(app, CharacterState::Permission, None, conversation_id.clone());
                     return Ok(());
                 }