yoda: rebase onto libcosmic-yoda via path deps + macOS controls toggle

Fresh rewiring from upstream master (78644a3) — the previous attempt on
051f4f9 was 137 commits behind and hit API drift (cosmic::iced_futures,
Subscription::run_with_id). Upstream master uses the newer API
(cosmic::iced::stream + Subscription::run_with) which our libcosmic-yoda
already supports.

Yoda wiring:
- [workspace.dependencies.libcosmic] (git pop-os) -> libcosmic-yoda { path, wayland }
- cosmic-config + iced_winit workspace deps -> path to libcosmic-yoda submodule
- [patch.pop-os/libcosmic] redirects transitive cosmic-config + cosmic-theme +
  iced_futures + iced_winit to our local paths so the graph resolves to a
  single copy (cosmic-bg/comp/idle/panel configs unify cleanly against master)
- subscriptions/sound + page + cosmic-settings inner Cargo.toml: libcosmic ->
  libcosmic-yoda (workspace + direct variants)
- winit feature dropped from libcosmic-yoda deps (our fork is Wayland-only)

Cherry-picked from leyoda/local/window-controls-position @ 52ce463:
- cosmic-settings/src/pages/desktop/window_management.rs — macOS toggle UI
- i18n/en + fr/cosmic_settings.ftl — translations

Installed at /usr/bin/cosmic-settings (yoda build, 78 MB).
Pre-yoda pacman version kept at /usr/bin/cosmic-settings.pre-yoda-fork.

page/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2024"
 derive_setters = "0.1.9"
 regex = "1.12.3"
 slotmap = "1.1.1"
-libcosmic = { workspace = true }
+libcosmic-yoda = { workspace = true }
 downcast-rs = "2.0.2"
 url = "2.5.8"
 slab = "0.4.12"