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/lib/tauri.ts

@@ -6,7 +6,11 @@ import { characterState } from "$lib/stores/character";
 import { configStore } from "$lib/stores/config";
 import { initStatsListener, resetSessionStats } from "$lib/stores/stats";
 import { initAchievementsListener } from "$lib/stores/achievements";
-import type { ConnectionStatus, PermissionPromptEvent } from "$lib/types/messages";
+import type {
+  ConnectionStatus,
+  PermissionPromptEvent,
+  UserQuestionEvent,
+} from "$lib/types/messages";
 import type { CharacterState } from "$lib/types/states";
 import {
   initializeNotificationRules,
@@ -317,6 +321,25 @@ export async function initializeTauriListeners() {
     }
   });
   unlisteners.push(permissionUnlisten);
+
+  const questionUnlisten = await listen<UserQuestionEvent>("claude:question", (event) => {
+    const questionEvent = event.payload;
+
+    // Store question request for the specific conversation
+    if (questionEvent.conversation_id) {
+      claudeStore.requestQuestionForConversation(questionEvent.conversation_id, questionEvent);
+      claudeStore.addLineToConversation(
+        questionEvent.conversation_id,
+        "system",
+        `Question: ${questionEvent.question}`
+      );
+    } else {
+      // Fallback to active conversation if no conversation_id
+      claudeStore.requestQuestion(questionEvent);
+      claudeStore.addLine("system", `Question: ${questionEvent.question}`);
+    }
+  });
+  unlisteners.push(questionUnlisten);
 }
 
 export function cleanupTauriListeners() {