⚡ Bolt: Cache wasm manifest in memory

[himattm]

💡 What: Replaces repeated JSON parsing of the localStorage manifest with an in-memory manifestCache (initialized lazily) in KMP WasmJs.
🎯 Why: JSON decoding across the Kotlin/WasmJS interop boundary introduces significant performance overhead. Previously, the LocalStorageThemeCache read and parsed the __keys__ manifest from localStorage repeatedly on every put, evict, keys(), size(), etc.
📊 Impact: This heavily reduces main-thread blocking synchronous IO & JSON parsing, making WasmJS theme caching operations O(1) in-memory operations and massively faster when generating/loading multiple themes.
🔬 Measurement: Check the application metrics or profile the caching layer; WasmJS browser tests pass successfully and verify correctness is preserved.

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PR created automatically by Jules for task 16300322750952369918 started by @himattm

[google-labs-jules]

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[himattm]

Closing as superseded by #35, which is the latest cleaned LocalStorageThemeCache manifest-cache optimization merged to main. Keeping one canonical implementation avoids merging multiple generated variants of the same change.

[google-labs-jules]

Closing as superseded by #35, which is the latest cleaned LocalStorageThemeCache manifest-cache optimization merged to main. Keeping one canonical implementation avoids merging multiple generated variants of the same change.

Understood. Acknowledging that this work is superseded by #35 and stopping work on this task.