fix(ui): start with an anti-aliasing the graphics device can't do (#329)

Choosing 8x anti-aliasing in Preferences › Graphics on a device that
only allows 1x and 4x for the window's format made every later start
panic in wgpu's pipeline validation (`Sample count 8 is not supported
by format Bgra8Unorm on this device`), so the app could not be opened
again without editing graphics.json by hand.

- egui-wgpu (vendored): request TEXTURE_ADAPTER_SPECIFIC_FORMAT_FEATURES
  when the adapter has it (WebGPU only guarantees 1x and 4x), and clamp
  the sample count to the largest one the device supports for both the
  colour target and the depth/stencil format. The supported counts are
  exposed as `RenderState::msaa_supported`.
- At start, a saved count the device can't do goes back to the default
  (4x, or the largest supported count below it), is written back, and a
  "Settings were changed" notice says what changed.
- The Anti-aliasing list greys out unsupported counts, `ui.prefs`
  rejects them, and an invalid saved `msaa` loads as the default.
- New messages translated in en, de, ja and ko.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/ui-egui/src/locales/ja.json

@@ -11,6 +11,11 @@
   "dialog.selected_count": "↖ {count} 個選択",
   "document.save_changes": "{name} への変更を保存しますか？",
   "document.unsaved_changes": "{name} には保存されていない変更があります。保存しない場合、変更内容は失われます。",
+  "settings.msaa_applies_on_restart": "アンチエイリアスは次回 SolidCraft を起動したときに適用されます",
+  "settings.msaa_reset": "{setting}: {requested}× はこのグラフィックスデバイスではサポートされていないため、{reset}× に変更しました（サポート: {supported}）。",
+  "settings.msaa_unsupported": "このグラフィックスデバイスではサポートされていません",
+  "settings.reset_intro": "次の設定はこのコンピューターでは使用できず、SolidCraft が起動できなくなるため変更されました:",
+  "settings.reset_title": "設定が変更されました",
   "sketch.degrees_of_freedom": "自由度 {count}",
   "sketch.draw_curves": "{linetype}の曲線を描く",
   "sketch.make_selection": "選択を{linetype}にする",
@@ -27,6 +32,7 @@
   "ui.animate_view_changes": "視点変更をアニメーション表示",
   "ui.animation": "アニメーション",
   "ui.animation_speed": "アニメーション速度",
+  "ui.anti_aliasing": "アンチエイリアス",
   "ui.apply": "適用",
   "ui.arc": "円弧",
   "ui.assemble": "アセンブリ",
@@ -199,6 +205,7 @@
   "ui.one_side": "片側",
   "ui.open": "開く",
   "ui.open_ellipsis": "開く...",
+  "ui.open_preferences": "環境設定を開く",
   "ui.open_recent": "最近使った項目を開く",
   "ui.operation": "操作",
   "ui.options": "オプション",