fix: harden admin runtime correctness and recovery

[sunnylqm]

What changed

• tolerate nullable Redis-backed quota and PV statistics in the admin user drawer
• show a retryable error state when the admin identity query fails instead of spinning forever
• stop create/update/delete mutations from synthesizing incomplete or empty app caches; refetch canonical data instead
• treat custom API endpoint changes as an authentication boundary by clearing the old session, workspace, and query cache before reload
• canonicalize endpoint URLs and allow plain HTTP only for local development
• bound the service-worker runtime cache and retry stale chunks once per UI build
• rank distribution-chart legends by cumulative request count rather than equal-weight daily percentages
• format daily distribution tooltips as dates without a meaningless 00:00

Tests added

• app mutation cache updater behavior
• custom endpoint URL normalization
• per-build chunk recovery guard
• distribution ranking under unequal daily traffic
• daily tooltip time formatting

Deliberately not changed

The HttpOnly cookie login/logout rollout and credential transport are not modified in this PR.

Validation

CI will run typecheck, Biome, Bun tests, production build, and bundle-size checks.

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