refactor: optimize polling and improve optimistic update stability

[SyedaAnshrahGillani]

Summary of Changes

1. Polling Optimization:

   • In packages/lib/queries.ts, I increased the refetchInterval for
     fetchSubscriptionStatus from 5 seconds to 60 seconds.
   • Impact: Subscription status is relatively static. Polling every 5
     seconds was unnecessarily aggressive, leading to excessive network
     traffic and load on the billing service (Autumn). Increasing this to 1
     minute significantly improves client performance and reduces server
     load without impacting user experience.

2. Optimistic Update Stability:

   • In packages/lib/queries.ts, I refactored the onMutate logic in the
     useDeleteDocument mutation.
   • Impact: The previous implementation only handled the pages structure
     used by infinite queries. If the documents-with-memories query was used
     as a standard query elsewhere in the app, the optimistic update would
     have failed or caused runtime errors. The new implementation safely
     handles both standard query (flat documents array) and infinite query
     (paged documents) structures, ensuring UI consistency and robustness.

3. Code Quality & Linting:

   • Refined the type narrowing in the setQueryData callback to satisfy
     Biome's linting rules, replacing any with safer unknown and
     Record<string, unknown> types.
   • Ensured the code follows the project's formatting standards by running
     biome check --write.

Verification

• Ran bun install to ensure all dependencies and lockfiles are correctly
  synchronized.
• Verified the changes with biome check to ensure no linting or formatting
  regressions.
• Confirmed that the repository's build system (Turbo) and package manager
  (Bun) are correctly utilized.