feat: update notice after a server update, keep the open tab on reload, chunked Whisper in Quick Dump, compact emoji picker

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/version.ts

@@ -2,3 +2,8 @@ declare const __APP_VERSION__: string;
 
 /** Version shown in the header; set at build time in vite.config.ts. */
 export const APP_VERSION = typeof __APP_VERSION__ !== 'undefined' ? __APP_VERSION__ : 'dev';
+
+declare const __APP_BUILD__: string;
+
+/** ID of this build; version.json on the server names the build that is live now. */
+export const APP_BUILD = typeof __APP_BUILD__ !== 'undefined' ? __APP_BUILD__ : '';