Send raw surface application_id in foreign toplevel app_id events

[Copilot]

Related: #4946

What's new?

application_id handling was inconsistent: we stored the raw value but repeatedly resolved it to desktop-file-derived IDs at emission points. This change keeps app_id protocol output aligned with the surface’s actual application_id and stops overloading that field with desktop-file resolution.

• Foreign toplevel app_id semantics

  • wlr-foreign-toplevel-management and ext-foreign-toplevel-list now emit raw surface->application_id() (and the observer callback’s application_id) directly.
  • Removed send-path calls to DesktopFileManager::resolve_app_id(...) in:
    • src/server/frontend_wayland/foreign_toplevel_manager_v1.cpp
    • src/server/frontend_wayland/foreign_toplevel_list_v1.cpp

• Scope intentionally limited

  • No protocol additions in this PR.
  • DesktopFileManager resolution logic remains available for contexts that explicitly need desktop-file lookup.

// before
auto app_id = desktop_file_manager->resolve_app_id(surface);
handle.send_app_id_event(app_id);

// after
handle.send_app_id_event(application_id);

How to test

• Verify that foreign toplevel app_id now matches the surface-set application_id exactly, including cases that previously mapped to desktop file IDs (e.g. gnome-terminal-server).
• Verify update events after set_app_id propagate the exact value provided by the client.

Checklist

• Tests added and pass
• Adequate documentation added
• (optional) Added Screenshots or videos

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• dl.google.com
  • Triggering command: /usr/lib/apt/methods/https /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)