Merge upstream/master (COSMIC 1.6) into main

Aligne le fork sur epoch-1.6.0 (63 commits amont) en preservant les 19
commits yoda.

Resolutions notables :
- les cfg `all(feature = "wayland", target_os = "linux")` deviennent
  l alias `wayland_platform` introduit en amont ; il exclut winit comme
  le faisait le patch yoda 45eaaf16, l intention est donc preservee ;
- les features iced `cctk` ont ete renommees `wayland` en amont, la
  feature `wayland` locale est adaptee ; `winit` reste un marqueur vide
  et `iced/winit` est liste explicitement ;
- cctk/ashpd gardent leurs chemins locaux dans la section conditionnelle
  unix introduite en amont ;
- la garde anti-crash c0b653f5 (context_menu non assigne) est conservee
  par-dessus la nouvelle structure amont ;
- traductions ca/oc restaurees depuis amont.

Le submodule iced suit (merge + correctif du cfg cctk residuel).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Cargo.toml

@@ -74,6 +74,7 @@ serde-keycode = ["iced_core/serde"]
 single-instance = ["zbus/blocking-api", "ron"]
 # smol async runtime
 smol = ["dep:smol", "iced/smol", "zbus?/async-io", "rfd?/async-std"]
+# Tokio async runtime
 tokio = [
     "dep:tokio",
     "ashpd?/tokio",
@@ -87,19 +88,22 @@ tokio = [
 # We still need iced/winit because pop-os/iced hosts the runtime dispatcher
 # (`iced_winit as shell`) there — the name is a misnomer, it's the same crate
 # that provides both the winit path AND the sctk/cctk wayland path.
+# COSMIC 1.5/1.6 renamed the iced `cctk` features to `wayland`; the local
+# `winit` feature stays empty in this fork, so iced/winit is listed explicitly
+# instead of going through it.
 wayland = [
     "ashpd?/wayland",
     "autosize",
+    "multi-window",
+    "surface-message",
+    "winit",
     "iced/winit",
     "iced/wayland",
     "iced_winit/wayland",
-    "iced_runtime/cctk",
-    "iced_winit/cctk",
-    "iced_wgpu/cctk",
-    "iced/cctk",
+    "iced_runtime/wayland",
+    "iced_wgpu/wayland",
     "dep:iced_winit",
     "dep:cctk",
-    "surface-message",
 ]
 surface-message = []
 # multi-window support
@@ -126,11 +130,9 @@ async-std = [
 
 [dependencies]
 apply = "0.3.0"
-ashpd = { version = "0.12.3", default-features = false, optional = true }
 async-fs = { version = "2.2", optional = true }
 async-std = { workspace = true, optional = true }
 auto_enums = "0.8.8"
-cctk = { path = "../cosmic-protocols/client-toolkit", package = "cosmic-client-toolkit", optional = true }
 jiff = "0.2"
 cosmic-config = { path = "cosmic-config" }
 cosmic-settings-config = { path = "../cosmic-settings-daemon/config", optional = true }
@@ -176,7 +178,9 @@ ron = { workspace = true, optional = true }
 enumflags2 = "0.7.12"
 
 # Enable DBus feature on Linux targets
-[target.'cfg(target_os = "linux")'.dependencies]
+[target.'cfg(all(unix, not(any(target_os = "redox", target_family = "wasm", target_os = "android", target_vendor = "apple"))))'.dependencies]
+cctk = { path = "../cosmic-protocols/client-toolkit", package = "cosmic-client-toolkit", optional = true }
+ashpd = { version = "0.12.3", default-features = false, optional = true }
 cosmic-config = { path = "cosmic-config", features = ["dbus"] }
 cosmic-settings-daemon = { path = "../dbus-settings-bindings/cosmic-settings-daemon" }
 zbus = { version = "5.14.0", default-features = false }
@@ -302,3 +306,9 @@ opt-level = 3
 
 [dev-dependencies]
 tempfile = "3.27.0"
+
+[workspace.package]
+edition = "2024"
+
+[build-dependencies]
+build_helpers = { path = "./iced/build_helpers" }