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feat(playground): persist MCP App UI metadata cache across restarts

getCachedUiMetadata() now seeds the in-memory cache from SQLite on first access via ensureUiMetadataLoaded(), and createMcpTools() calls replaceAllMcpAppUiMetadata(cachedUiMetadata) at the end of each stream setup (even when empty, so servers that lost all UI tools have their stale rows pruned). Historical tool parts with _meta.ui now remount McpAppView on app restart without first requiring a new streaming session to repopulate the cache.