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.

i18n/en/cosmic_settings.ftl

@@ -484,6 +484,7 @@ window-controls = Window controls
     .maximize = Show maximize button
     .minimize = Show minimize button
     .active-window-hint = Show active window hint
+    .position-start = Place buttons on the left (macOS style)
 
 focus-navigation = Focus navigation
     .focus-follows-cursor = Focus follows cursor

i18n/fr/cosmic_settings.ftl

@@ -322,6 +322,7 @@ window-controls = Contrôles des fenêtres
     .maximize = Afficher le bouton maximiser
     .minimize = Afficher le bouton minimiser
     .active-window-hint = Afficher l'indice de la fenêtre active
+    .position-start = Placer les boutons à gauche (style macOS)
 focus-navigation = Navigation par le focus
     .focus-follows-cursor = Le focus suit le curseur
     .focus-follows-cursor-delay = Délai de suivi du focus en ms