feat(heater-history): track nozzle / bed / chamber readings + per-tile chart-icon overlay opens history modal

New PrinterSensorHistory table + 60s recorder + GET/DELETE /printer-sensor-history
  route gated behind a new PRINTER_SENSOR_HISTORY_READ scope (separate from AMS). UI
  adds a 10x10 LineChart icon on each heater tile - click body opens the existing
  target-temp popover unchanged, click icon opens a HeaterHistoryModal mirroring the
  AMSHistoryModal shape (kind toggle + 6h/24h/48h/7d range + current/avg/min/max +
  recharts line for value + dashed target). Read-only X1C/P2S chamber tile finally
  gets an interaction. Retention configurable via printer_sensor_history_retention_days
  (default 30, sibling of ams_history_retention_days). 8 new i18n keys translated in
  all 11 locales, parity green. 4 backend + 6 frontend tests added; full pytest -n 30
  6226/6226, vitest 2176/2176, ruff/eslint/build all clean.

README.md

@@ -164,6 +164,7 @@ Optional but recommended — drop the [`slicer-api/` Compose stack](slicer-api/R
 - Configurable drying presets per filament type (temperature & duration for AMS 2 Pro and AMS-HT)
 - Dual external spool support for H2D (Ext-L / Ext-R)
 - HMS error monitoring with history and clear errors
+- **Heater history charts** — Bambuddy logs nozzle, bed, and chamber readings every minute and surfaces them via a tiny chart icon on each heater tile in the printer card. Click for a per-heater modal with current / average / min / max stats, target overlay, and a 6h / 24h / 48h / 7d time range — works on read-only chamber sensors (X1C / P2S) too. AMS humidity and temperature get the same treatment (already shipped).
 - Print success rates & trends
 - Filament usage tracking
 - Cost analytics & failure analysis