More chat icons; message menu inside the bubble

- 18 more icons (gamepad, computer, food, ...) with a test that keeps the
  server whitelist and the client picker identical.
- The ⋯ menu of a message moves into the bubble foot (next to the time); its
  popup opens upwards inside the bubble and is limited to the bubble's width.

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

web/src/whatsnew.ts

@@ -3,6 +3,10 @@
  * under "unreleased"; scripts/release.sh renames the key to the release version.
  */
 export const WHATS_NEW: Record<string, { en: string[]; de: string[] }> = {
+  unreleased: {
+    en: ["18 more icons for chats (gamepad, computer, food, …); the ⋯ menu of a message now sits inside its bubble"],
+    de: ["18 weitere Icons für Chats (Gamepad, Computer, Essen, …); das ⋯-Menü einer Nachricht sitzt jetzt in der Sprechblase"],
+  },
   "202611-00027": {
     en: ["Chat bubbles (yours on the right), icons for chats and more vivid, clearly different colour tags (⋯ menu of a chat)"],
     de: ["Sprechblasen (deine rechts), Icons für Chats und kräftigere, besser unterscheidbare Farbmarkierungen (⋯-Menü eines Chats)"],