fix #391: curated modern-only resolution list from the monitor's modes

User-directed (2026-08-13): "we should only support modern resolutions.
Not any old format." New DisplayModeCatalog enumerates the window's
monitor (Silk IMonitor.GetAllVideoModes) once at GameWindow load and
curates via a pure, tested rule: modern widescreen families only
(16:9/16:10/21:9/32:9 within 2.5%), at least 1280 wide, must fit the
desktop (an impossible windowed pick is not offered - the measured
3840x2160-on-2560x1440 silent clamp class), desktop mode always
included, refresh-rate duplicates collapsed, ascending order.

The Config Resolution row consumes the catalog through two new optional
Bind parameters; its Defaults value becomes the desktop's own mode.
Fixture/headless callers keep the static preset ladder, which now drops
800x600 and is pinned by test to pass the same curation rule (the OP6 S4
"default must be re-selectable" invariant holds on both paths).

Deliberate retail deviation, register row IA-22: retail listed the
adapter's complete enumeration including 4:3 legacy modes and authored
800x600 as the Config default (gmConfigUI::InitOptions
SetDefaultValue(0x03200258); gmClient::Init @0x004047af). The catalog is
also the designated fullscreen mode-switch validation source for
#376/#388 - an offered mode is supported by construction.

Tests: DisplayModeCatalogTests (8 - filter/clamp/dedupe/sort/ultrawide/
desktop-inclusion/fallback-consistency); ConfigOptionsPageControllerTests
row-12 default updated. App suite 4,961/3 skips; UI.Abstractions 916.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AcDream.App/Rendering/GameWindow.cs

@@ -1241,6 +1241,10 @@ public sealed class GameWindow :
         // equivalent gate already ran inside VulkanGraphicsContext.Acquire and
         // wrote its own report.
 
+        // #391: capture the monitor's curated resolution catalog once, on the
+        // windowing thread, before any Options-panel mount reads it.
+        DisplayModeCatalog.InstallFromWindow(_window!);
+
         GameWindowCompositionPipeline.Run<
             GameWindowPlatformResult<GameWindowGraphics, IInputContext>,
             HostInputCameraResult,