fix(qt): keep desktop session reports in control of focus

[zortos293]

The newly enabled desktop session-report path from #1123 opens after navigation to game details. The details modal's deferred focus callback could then take focus from the report, leaving Return and Space routed to the background game action.

• Give desktop session reports the existing shared modal owner, which disables background route input and reclaims focus from deferred callbacks. Keep system-warning precedence and other desktop overlays unchanged.
• Add stable report/control targets and two normal/reduced-motion regression cases in the existing detail acceptance workload. Verify default Done focus, no background Play signal, safe dismissal, focus hand-back, and Diagnostics activation without weakening existing detail checks.

Both new tests failed before the fix and pass afterward. 466/466 Qt CTest targets, 217 Python contracts, localization validation, and git diff --check pass. Fresh active-window fixtures exercise actual mocked stop responses through report construction, Done/Diagnostics, disabled reports and unavailable/error telemetry, plus Return/Space isolation. Preserved Store/chip/Friends regressions and all 16 deferred screenshot window/motion cases pass.

The grouped post-merge audit used the actual #1124 and #1123 landed trees separately, then this fix. These are credential-free Linux Qt fixtures, not live gameplay, physical-controller, hardware decode/HDR, Windows UI, Wayland, physical DPR/monitor migration, audible/system-mute, or Flatpak acceptance. Report data, layouts and native media are unchanged.

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