fix: recover native player artwork and background after lifecycle changes

[Kifranei]

Repeated rotation, view recreation, or returning from the background can leave the native player using an intermediate artwork size or a shader backed by a recycled blur bitmap. Static covers can progressively shrink, and the player background can turn gray.

This adds an always-on native player recovery capability for the verified Apple Music 7.0.0-beta / 1606 profile:

• Use the settled native square artwork slot as the static size baseline, reconcile stale child dimensions and cached resize targets, and preserve native playback scaling, video sizing, and transition animations.
• Clear invalid derived blur/shader caches after detachment and restore the native background pipeline after attachment, resume, or artwork replacement, using a valid queued/current bitmap or the foreground artwork.

Both repairs install through one registration scope, with exact method/field contracts resolved before activation. Unknown/legacy hosts remain unsupported; partial installation leaves hooks dormant. Native pane destruction removes view identities and animation/draw listeners. The capability works independently of optional dual-pane/glass settings and does not require a media plugin.

Validation:

• Full repository tests: 1,077 test executions, 0 failures/errors/skips, including artwork geometry, installation failure cleanup/idempotence, and operation with optional layouts disabled.
• Required app, host, glass, and plugin Lint checks plus Release APK assembly passed.
• Architecture, pinned glass sources, and profile compatibility checks passed; 287 host descriptor checks against the original 1606 APK passed.

The background repair's source implementation was previously exercised through repeated rotation on a Xiaomi Pad 5. This host integration has not had a new device run, and the phone artwork fix still needs device regression testing. Existing media-plugin recovery hooks can coexist and may report non-exclusive overlap diagnostics; no device test with both implementations enabled was performed.

[Zennmn]

@codex review

[Kifranei]

@codex review it