[ZhangHanDong]

Cached room panes can consume navigation actions emitted by another pane, including another pane showing the same room. Bind thread and search-result actions to their owning pane and accept room controls only from explicit local widget IDs. This keeps opening a thread, search, or room details scoped to the pane the user operated.

Validation:

• Four ownership example/property tests passed; the release workspace suite passed 711 tests with five existing ignored tests.
• The release app build, release workspace Clippy, static UX gate, typos, and Cargo patch guard passed. The full spec guard passed; the active ownership contract passed 5/5 checks and the encryption capability passed 7/7, with no skips or uncertain results in either. Existing manual scenarios in other contracts retain their normal manual status.
• Independent review found no source/spec issues. No new strings, layout, dependencies, or Matrix request paths.

The same ownership source was exercised in the preceding local Docker Palpo / Studio / Computer Use run, including returning between rooms and expanding the final thread. That combined run used the newer Makepad dev dependency; this isolated repair keeps the current main dependency. A new combined GUI regression is tracked separately.

Remote CI: all 13 checks passed on a00f04267e49b1bc18f9bdd29cea73f0e5a5b66a, including Linux, Windows, macOS, iOS and Android builds.