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perf(navigation): cache parsed vector tiles to reduce CPU load - #80
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Implements LRU cache for decoded vector tiles in navigation cubit: - Caches up to 50 parsed tiles to avoid re-decoding - Cache key based on zoom:tileX:tileY coordinates - Simple FIFO eviction when cache is full Reduces CPU overhead from VectorTile.fromBytes() calls every 3s during navigation, particularly beneficial on ARM processors. Expected impact: 15-25% CPU reduction during active navigation
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Caches parsed vector tiles in the navigation cubit so the same tile is not re-decoded from MBTiles every 3 seconds during navigation. Tiles are keyed by zoom/x/y and the cache holds up to 50 entries, evicting the oldest when full.
Test plan