docs: add v0.34.0 changelog to HISTORY.md

HISTORY.md

@@ -1,5 +1,23 @@
 # Bill Tracker — Changelog
 
+## v0.34.0
+
+### 🚀 Features
+
+- **Overdue Command Center** — Tracker page now shows a collapsible command center for overdue bills. Per-bill Pay Now, Skip, and Snooze (1/3/7 days). Snoozed bills hidden with a count hint in the header.
+- **Sidebar overdue badge** — Tracker menu item shows live overdue count on desktop nav pill and mobile drawer.
+- **Snooze persistence** — `snoozed_until` column on `monthly_bill_state` (migration v0.70). Backend validates and persists snooze dates through `PUT /bills/:id/monthly-state`.
+- **Overdue count endpoint** — `GET /api/tracker/overdue-count` with client-side polling (2-min stale, 5-min poll, tab-only).
+
+### 🔧 Changed
+
+- **CleanupService** — Uses `BACKUP_DIR` import from backupService directly. Added `.xlsx` export file sweep with 24h cutoff.
+- **BackupScheduler** — `computeNextRun` now exported for external use.
+- **Roadmap grid** — Sizes from populated priority lanes only. With a single lane (e.g. only LOW items), lane uses full width instead of narrow 5-column slot.
+- **Bump** — `0.33.8.7` → `0.34.0`
+
+---
+
 ## v0.33.8.7
 
 ### 🛠 Reverted