[Performance] Image cache unbounded — fills device storage during heavy course catalog browsing

[RUKAYAT-CODER]

Overview

src/services/imageCache.ts caches downloaded images to the file system via expo-file-system without enforcing a total size limit. Heavy course browsing accumulates hundreds of megabytes in the app cache directory, triggering OS-level storage warnings and unexpected cache eviction behavior.

Specifications

Features:

• Image cache enforces 100MB maximum size
• When 80% full, least-recently-used images evicted automatically
• Cache size exposed as metric in memoryPressureService
• Cache cleared on memoryPressureService critical event

Tasks:

• Add LRU eviction to imageCache.ts with MAX_CACHE_SIZE_BYTES = 100 * 1024 * 1024
• Track total cached bytes and access timestamps per entry
• Implement evictLRU(targetBytesToFree: number) method
• Subscribe imageCache.clearNonCritical() to memoryPressureService critical event
• Add unit test confirming eviction fires at 80MB when 81st MB pushed

Impacted Files:

• src/services/imageCache.ts
• src/components/common/CachedImage.tsx

Acceptance Criteria

• Image cache does not exceed 100MB on disk
• LRU eviction fires when cache reaches 80MB
• Critical memory pressure clears all non-pinned cached images
• Unit test confirms eviction at 80% threshold

[rindicomfort]

@rindicomfort has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello Maintainer,

Please I’d love to take this issue on. I’m a smart contract and full-stack developer with experience across OnlyDust, Drips Waves

My stack includes Rust, Soroban, Cairo, Solidity, and TypeScript. I can deliver a clean, tested, and well-documented solution within 24 hours of assignment.

Happy to start immediately. Thank You

ℹ️ Repo Maintainers: To accept this application, review their application or assign @rindicomfort to this issue.

[dominiccreates]

@dominiccreates has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainers. I'm a Web3 Fullstack dev. I've worked on a similar work. Would be done before the ETA. Thank you

ℹ️ Repo Maintainers: To accept this application, review their application or assign @dominiccreates to this issue.

[Wildflower-mariposa]

@Wildflower-mariposa has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello,

I'd like to work on this issue. I can implement LRU-based image cache management with configurable size limits, automatic eviction, memory pressure integration, and comprehensive test coverage while preserving existing caching behavior.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Wildflower-mariposa to this issue.