fix(qt): preserve Game Mode focus and screenshot cancellation

[zortos293]

Fixes four behavioral regressions found in the post-merge audit of #1120. This preserves the approved Game Mode layout and stays separate from #1123's Paper-spacing work.

Navigation and shared controls

• Restore Store selection against the loaded catalog instead of capping it to the first 30 tiles, and reveal the selected tile after Back or delayed loading.
• Keep focused store-chip identity through metadata reorder and delegate removal. Enter resolves that identity even before deferred focus restoration, without selecting a different store or taking focus from a sheet or new action.
• Add opt-in compact typography for the existing 56px desktop Friends rows. Default console setting rows retain their redesigned layout.

Deferred screenshots

Cancel a pending guide screenshot immediately when another overlay opens, media readiness is lost, or the session changes. An uninterrupted request still waits for guide dismissal and two rendered frames, retains the same native item, and captures exactly once.

Verification

• New regression checks failed before the fixes for Store selection, reordered chip focus, compact-row overflow, and transient-overlay screenshot cancellation.
• 424/424 Qt CTest targets passed on the final build, including normal/reduced-motion and windowed/fullscreen session checks. 217 Python contracts, localization validation, and git diff --check passed.
• Matched active Qt parent/merge/fixed renders use identical data, dimensions, and Nocturne settings. Broader fixtures cover all eight settings sections, supporting pages, long German text, empty/loading/error/populated data, overlays, and desktop shared controls at 960×540, 1280×800, and 1920×1080, with simulated 1.25/1.5 scaling.
• Actual focused guide Enter saves exactly one scratch screenshot after two clean frames; transient overlay and session-replacement races produce zero attempts. Real X11 pointer/keyboard checks confirm the UI-sounds toggle, held-key skip drain, destination preservation, and safe Enter activation.
• Independent GPT-6.1 Sol review found no blocking production issue; its two coverage gaps were exercised afterward.

These are credential-free Linux Qt fixtures, not live gameplay, hardware decode/HDR, physical-controller, audio audibility/system-mute, Windows, Wayland, or Flatpak acceptance.

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