feat: Add clear chat history button to drawer

Adds a button to the sidebar drawer for clearing chat history.
The button uses a confirmation prompt to ensure user intent and clears the database entries.
This allows users to reset their chat history for a fresh start.
The button uses a tooltip to provide more information on its function.

wxt.config.ts

@@ -50,7 +50,7 @@ export default defineConfig({
   outDir: "build",
 
   manifest: {
-    version: "1.2.3",
+    version: "1.2.4",
     name:
       process.env.TARGET === "firefox"
         ? "Page Assist - A Web UI for Local AI Models"