Walkthrough

This pull request refactors multiple composables and a page component to optimise reactivity tracking. Several composables switch from standard ref() to shallowRef() for primitive boolean and simple values (isRateLimited, activeId, canGoBack, isLikeActionPending). The useCharts composable centralises date parsing through a dedicated parseIsoDateOnly helper. useFileTreeState removes a computed wrapper for state key generation, using direct string concatenation instead. usePreferencesProvider adds the defu utility for safer object merging, constrains its generic type parameter to object, and replaces the spread operator merge strategy with defu() for loading stored preferences.

Possibly related PRs

• perf: speed up algolia 🚀 + split out search suggestion logic #1271: Directly modifies the same useSearch.ts file with alternative Algolia multi-search implementation
• feat: use native scroll anchoring #1209: Modifies the useActiveTocItem.ts composable's reactive state declaration
• chore(ui): consistent back navigation #1164: Modifies the useCanGoBack composable introduced in this PR

Suggested reviewers

• danielroe

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