fix(calls): the call PiP no longer opens on top of the composer (#323)

The first-use PiP position was bottom-right, 72px from the bottom: on
desktop over Send, on phones over Send, Emoji and the message box, so
the first thing you typed or tapped in the text room hit the call.
Default to top-right under the room header instead. A dragged position
is still remembered.

Refs #323

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/components/CallEmbedProvider.tsx

@@ -89,6 +89,8 @@ import { zIndices } from '../styles/zIndex';
 
 const PIP_MIN_W = 200;
 const PIP_MIN_H = 112;
+/** Default PiP top: just below the 64px-ish room header. */
+const PIP_DEFAULT_TOP = 72;
 
 type Corner = 'se' | 'sw' | 'ne' | 'nw';
 
@@ -1046,8 +1048,11 @@ export function CallEmbedProvider({ children }: CallEmbedProviderProps) {
           el.style.left = `${Math.max(0, Math.min(savedPos.left, window.innerWidth - 280))}px`;
           el.style.top = `${Math.max(0, Math.min(savedPos.top, window.innerHeight - 158))}px`;
         } else {
-          el.style.left = `${window.innerWidth - 280 - 16}px`;
-          el.style.top = `${window.innerHeight - 158 - 72}px`;
+          // [Gitea #323] First use: top-right under the room header, over the
+          // timeline. Bottom-right sat on the composer (Send / Emoji, and on
+          // phones the whole message box), so typing landed on the call.
+          el.style.left = `${Math.max(0, window.innerWidth - 280 - 16)}px`;
+          el.style.top = `${PIP_DEFAULT_TOP}px`;
         }
         el.style.width = '280px';
         el.style.height = '158px';