Carry validated output luminance into HDR session requests

[zortos293]

Changes

Stacked on #962. This PR contains only the HDR display-metadata layer.

Carry the current Wayland output's validated target luminance through HdrOutput, CoreClient, and the native core into CloudMatch HDR monitor requests. Keep the documented requested-content defaults when the output has no validated snapshot.

Discard stale snapshots after display changes and strip caller-supplied values when Qt has no current output metadata. Treat the snapshot as transient runtime data: reject settings writes and remove persisted copies. Do not invent display primaries or a sustained full-frame luminance value for the vendor payload.

Verification

Independently reviewed the final propagation and invalidation paths. After stacking on the exact reviewed #962 commit:

• Core and streamer formatting checks passed.
• Locked core Clippy passed with warnings denied.
• The full core suite passed, including 363 main tests and 31 library tests.
• The Qt application and tests built successfully.
• Five focused HDR and CoreClient tests passed.
• All 337 Qt tests passed in a complete rerun after a machine restart interrupted the first attempt.

Regression coverage includes output metadata changes, malformed ranges, stale caller snapshots, settings persistence, and unavailable-output fallback.

Limits

No HDR-capable Wayland compositor, physical display, VAAPI GPU, or live GeForce NOW account was available. These checks establish metadata validation and request propagation, not optical calibration or live HDR output.

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