Fix New Session bug: use async Tauri dialog instead of window.confirm

- Tauri overrides window.confirm to return Promise, not boolean
- Changed clearSession to async function using Tauri's ask() dialog
- Now properly waits for user confirmation before clearing state
- Removed debug logging
- All quality checks passing

src/components/Chat.tsx

@@ -1,5 +1,6 @@
 import { invoke } from "@tauri-apps/api/core";
 import { listen } from "@tauri-apps/api/event";
+import { ask } from "@tauri-apps/plugin-dialog";
 import { useEffect, useRef, useState } from "react";
 import Markdown from "react-markdown";
 import { Prism as SyntaxHighlighter } from "react-syntax-highlighter";
@@ -163,25 +164,21 @@ export function Chat({ projectPath, onCloseProject }: ChatProps) {
     }
   };
 
-  const clearSession = () => {
-    // Store current state in case we need to debug
-    console.log("clearSession called, messages count:", messages.length);
-
-    const confirmed = window.confirm(
+  const clearSession = async () => {
+    const confirmed = await ask(
       "Are you sure? This will clear all messages and reset the conversation context.",
+      {
+        title: "New Session",
+        kind: "warning",
+      },
     );
 
-    console.log("User confirmed:", confirmed);
-
-    if (confirmed === true) {
-      console.log("Clearing session...");
+    if (confirmed) {
       setMessages([]);
       setStreamingContent("");
       setLoading(false);
       // TODO: Add backend call to clear context when implemented
       // invoke("clear_session").catch(console.error);
-    } else {
-      console.log("User cancelled, keeping messages");
     }
   };