v1.7.15 — i18n audit, splash min 3s, decimal precision, demo GIF, README fixes

- Complete i18n audit: 25+ new translation keys (en/it/de) — vacuum toast,
  TTS voices, timer steps, product notes, error prefixes, form placeholders,
  barcode hints, recipe/cooking ingredient labels, unit variants
- pz/conf unit labels now use t('units.pz') / t('units.conf') throughout
- Splash screen: minimum 3-second display (_splashStart recorded at parse
  time, fade delayed by remaining ms if app loads faster)
- Quantity decimal precision: qtyNum in recipe/cooking buttons and conf
  fallback display capped to 1 decimal (was showing 7+ from raw AI output)
- Recipe/cooking buttons: removed Italian fallback strings from t() calls
- README: translated remaining Italian phrases; added demo.gif to Screenshots
- CHANGELOG: updated 1.7.15 entry with all session changes
- assets/img/demo.gif: EverShelf.gif processed at 2x speed (~36s)

CHANGELOG.md

@@ -11,6 +11,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - **Recipe scraps tips** — During cooking steps, detect "waste" generated (peels, cores, bones, eggshells, coffee grounds, citrus zest, etc.) and surface AI-powered tips on how to reuse them (compost, natural cleaner, broth, candied peel, etc.). Could be shown as an optional collapsible hint card below the step that generates the scrap.
 
+## [1.7.15] - 2026-05-16
+
+### Added
+- **Full i18n audit** — Comprehensive sweep of all user-visible strings in `app.js` and `index.html`. 25+ new translation keys added across `it.json`, `en.json`, `de.json`, covering: vacuum toast, TTS voice controls, timer step labels, product note labels, error messages, expiry form, barcode hint, category select placeholder, cooking step fallback, `form.select_placeholder`, `btn.yes_short`/`no_short`, `add.vacuum_question`, `add.vacuum_saved`, `move.vacuum_seal_rest`, `cooking.step_fallback`, `error.prefix`/`unknown`, `product.select_variant`, and more.
+- **Splash screen redesign** — Logo displayed prominently, spinner below, app version shown at the bottom; version label injected dynamically at boot time so it never gets out of sync. Minimum 3-second display duration enforced: `_splashStart` is recorded before `DOMContentLoaded`; the fade-out is delayed by the remaining time if the app loads faster than 3 s.
+- **Demo GIF in README** — `assets/img/demo.gif` (processed at 2× speed, ~36 s) added to the `## 📸 Screenshots` section.
+- **`pz`/`conf` unit labels translated** — "pz" now shows as "pcs" in English and "Stk" in German; "conf" shows as "pkg" / "Pkg". All `unitLabels` objects in JS now use `t('units.pz')` / `t('units.conf')`.
+
+### Fixed
+- **Logo white background on splash screen** — Re-processed both `logo.png` and `logo_icon.png` with fuzz 35% alpha extraction, removing the white background that was visible against the dark splash background (`#0f172a`).
+- **Recipe button label** — Shortened to "Ricetta" / "Recipe" / "Rezept" for compact display in the inventory quick-action modal.
+- **Quantity decimal precision** — `qtyNum` in recipe/cooking ingredient buttons and `conf` fallback display in inventory cards now limited to 1 decimal place (was showing 7+ decimal places from raw AI output, e.g. `0.25353223 conf`).
+- **"Errore" / "Error" fallback strings** — All remaining Italian hardcoded `'Errore'` fallbacks in `showToast()` calls replaced with `t('error.generic')`. Italian fallback strings removed from buttons that already used `t()`.
+- **README Italian phrases** — "La quantità è giusta (2 pz)", "🤖 Spiega", "Latte / Affettato / Panna da cucina", "Buon appetito!", "L'ho buttato" replaced with English equivalents in the README.
+
 ## [1.7.14] - 2026-05-16
 
 ### Added