release: v1.7.23

- README: update feature callout to v1.7.23, add DB maintenance section,
  update dark mode description (time-based auto), add vacuum-sealed expiry
  paragraph, add new .env params (retention, vacuum, Gemini costs)
- CHANGELOG: add v1.7.23 entry (Generali tab, DB cleanup, vacuum expiry,
  AI tracking, time-based theme, ZeroWaste/screensaver save fix)
- manifest.json: version 1.7.22 → 1.7.23
- index.html: version label and preloader updated to v1.7.23; asset v=20260518c

README.md

@@ -38,10 +38,11 @@
 
 ## ✨ Features
 
-> ♻️ **New in v1.7.19 — Zero-waste cooking tips**
-> During cooking, EverShelf shows a contextual ♻️ tip card for each step that generates reusable scraps — peels, cooking water, egg whites, cheese rinds, bread crusts and more.
-> Tips are generated by Gemini *as part of the recipe* at zero extra API cost, shown inline in cooking mode, and dismissible per step.
-> Enable the toggle in **Settings → Zero-waste tips** (default: off).
+> ⚙️ **New in v1.7.23 — Global settings tab, DB auto-cleanup, vacuum-sealed expiry**
+> A new **Generali** tab groups all global settings (language, currency, theme, screensaver, zero-waste, export) in one place.
+> Recipes older than `RECIPE_RETENTION_DAYS` and transactions older than `TRANSACTION_RETENTION_DAYS` are deleted automatically every cron cycle, followed by a SQLite `VACUUM` to keep the database small.
+> Vacuum-sealed products get an extended grace period (`VACUUM_EXPIRY_EXTENSION_DAYS`, default 30 days) before being flagged as expired.
+> Auto theme now follows **time of day** (dark 20:00–07:00) instead of the OS setting, making it server-friendly.
 
 ### 📦 Inventory Management
 - **Export inventory** — Download the full inventory as a UTF-8 CSV (Excel-compatible) or open a print-ready page to save as PDF; export button always visible in the inventory page header
@@ -50,7 +51,7 @@
 - **Smart locations** — Track items across Pantry, Fridge, Freezer, and custom locations
 - **Expiry tracking** — Automatic shelf-life estimation based on product type and storage
 - **Opened product tracking** — Reduced shelf-life calculation when packages are opened; opened-product expiry is now also checked when building banner alerts (not just the dashboard section)
-- **Vacuum-sealed support** — Extended expiry dates for vacuum-sealed items
+- **Vacuum-sealed support** — Extended expiry dates for vacuum-sealed items; products sealed under vacuum are only flagged as expired after a configurable grace period past the printed date (`VACUUM_EXPIRY_EXTENSION_DAYS`, default 30 days, configurable in `.env`)
 - **Anomaly detection** — Banner alerts for suspicious quantities and consumption predictions with inline correction; dismiss button now shows the current inventory quantity so the action is unambiguous ("Quantity is correct (2 pcs)")
 
 ### 🤖 AI-Powered (Google Gemini)
@@ -98,9 +99,15 @@
 - **Quick-access buttons** — Recently used and most popular products shown on the inventory page for fast access
 
 ### 🌙 Appearance
-- **Dark mode** — Three modes: Light, Dark, and Auto (follows the OS/browser setting); theme is applied before the first render to prevent a white flash on dark-mode systems; toggle in Settings → Appearance
+- **Dark mode** — Three modes: Light, Dark, and Auto (time-based: dark from 20:00 to 07:00, light otherwise); applies immediately without page reload; auto mode re-evaluates every 5 minutes, so night/day transitions happen automatically even on always-on kiosk displays; theme is applied before the first render to prevent a white flash
+- **Global settings tab** — A dedicated **⚙️ Generali** tab groups all system-wide settings (language, currency, theme, screensaver, zero-waste tips, export) at the top of the Settings panel
 
-### 📱 Progressive Web App
+### �️ Database Maintenance
+- **Automatic cleanup** — Recipes older than `RECIPE_RETENTION_DAYS` (default 7) and transactions older than `TRANSACTION_RETENTION_DAYS` (default 7) are deleted automatically on every cron cycle; SQLite `VACUUM` runs after each cleanup to keep the file compact
+- **Manual cleanup** — Trigger immediately via `GET /api/?action=db_cleanup`
+- **Compact by default** — Fresh installs stay small; large accumulated databases shrink back to a few hundred KB within one cron cycle
+
+### �📱 Progressive Web App
 - **Mobile-first design** — Optimized for phones, works on tablets and desktop
 - **Installable** — Add to home screen for a native app experience
 - **Multi-device** — All user data (shopping tags, pinned items, location preferences, scan history) is stored server-side in SQLite and shared across every device on the same instance; no data is siloed in a single browser's localStorage
@@ -192,6 +199,19 @@ TTS_URL=http://your-home-assistant:8123/api/events/tts_speak
 TTS_TOKEN=your_long_lived_token
 TTS_ENABLED=true
 
+# Optional: DB retention and cleanup (applied automatically each cron cycle)
+RECIPE_RETENTION_DAYS=7        # delete recipe plans older than N days
+TRANSACTION_RETENTION_DAYS=7   # delete stock transactions older than N days
+
+# Optional: Vacuum-sealed expiry grace period
+VACUUM_EXPIRY_EXTENSION_DAYS=30 # extra days before vacuum-sealed items are flagged expired
+
+# Optional: Gemini cost rates (USD per million tokens, for the Info tab cost estimate)
+GEMINI_COST_25F_IN=0.15
+GEMINI_COST_25F_OUT=0.60
+GEMINI_COST_20F_IN=0.10
+GEMINI_COST_20F_OUT=0.40
+
 # Optional: Security — protect the save_settings endpoint
 # Set a strong random string; the Settings UI will ask for it before saving
 SETTINGS_TOKEN=