Debounce MMCE interactive art enqueue and coalesce pending targets

[NathanNeurotic]

Motivation

• Reduce interactive art request churn in MMCE mode caused by per-frame selection changes and repeated requeues while a previous title's MMCE load is still in flight.
• Ensure queued MMCE interactive requests are coalesced by the stable startup key so only the intended newest target is kept.
• Preserve existing texture cleanup and displaced-texture behavior unless leak evidence appears.

Description

• Added a short MMCE-only debounce window (CACHE_MMCE_INTERACTIVE_DEBOUNCE) and tracking state (gMmceInteractiveDebounceUntilFrame, gMmceInteractiveDebounceValue) to delay enqueueing interactive MMCE requests for a few frames after a selection change, wired into cacheGetTextureInternal to gate interactive enqueue. (src/texcache.c)
• Implemented coalescing helpers that detect queued MMCE requests with the same startup value and drop queued MMCE requests for different values: cacheHasQueuedInteractiveMmceValueLocked, cacheDropQueuedInteractiveMmceDifferentValueLocked, and cacheShouldDebounceMmceInteractiveLocked. (src/texcache.c)
• Prevent reentrant MMCE churn by: dropping older queued MMCE interactive requests for different titles when a new title is selected, and when an MMCE interactive load is active, avoiding enqueueing replacements every frame if the newest target is already pending. (src/texcache.c)
• Left existing texture release/cleanup logic (cacheReleaseTexture, displaced texture handling, request cleanup/abort paths) unchanged. (src/texcache.c)
• Reviewed cacheAbortMmceImageLoadsTimed usage; confirmed the notable callsite in mmceLaunchGame remains a transition-time abort and was not altered. (src/mmcesupport.c)

Testing

• Attempted a full build with make -j2, which failed in this environment due to missing generated language source files (lng_src/Albanian.yml, lng_src/English.yml), so a complete build/test could not be completed here. (failure)
• Performed local code inspection and exercised the cache enqueue/dequeue logic paths with rg/sed/nl to verify inserted functions are called from the interactive enqueue flow and that existing request cleanup/abort paths remain intact. (inspection)

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Codex Task

[gemini-code-assist]

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