revert: roll back to v0.1.15 state

fix: var to let warning in LocalUsageParser

feat: local session fallback — parse JSONL files when API is unavailable

fix: proper 429 handling — show cached data, backoff retry, no token refresh

fix: resolve app freezing and stale usage data

feat: auto-refresh OAuth token on 429 and notify on updates

feat: improve auth recovery flow and simplify manual guidance

security: pin installer version and require checksum verification

fix: use session in hero ring and avoid duplicate session card

Update README to remove 'CLI' from description

docs: add QDock demo GIF to README

fix: enforce session-only menu bar source selection

chore: remove obsolete PLAN.md

feat: make menu bar usage session-based only

feat: simplify provider names and ignore local promo-video