derekc ce1e9c5134 Implement reliability improvements across frontend ...

- api.js: add exponential backoff retry (3 attempts, 500/1000/2000ms) for
  GET requests on network errors and 5xx responses; mutating methods are
  not retried since they are not idempotent
- api.js: add offline indicator — fixed pill banner appears at bottom of
  page when navigator goes offline, disappears when back online
- style.css: add styles for offline banner and session expiry warning
- auth.js: show amber warning banner below nav when session expires within
  24 hours (with exact hours remaining); dismissible with X button
- auth.js: fix password min-length client-side check from 6 to 10 to
  match the backend
- log.js, flock.js, budget.js: disable submit button during async request
  and re-enable in finally block to prevent double-submits and make loading
  state visible
- dashboard.js: fix chart date labels to use user's configured timezone
  instead of the browser's local timezone

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-18 00:09:36 -07:00

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