feat(plating): company-level UoM defaults — F/C, mils/microns, etc.

Different facilities use different measurement systems. North-American
aerospace shops live in °F + mils + gallons + lb; ROW + most metric
shops use °C + microns + litres + kg. Add company-level defaults so
each shop picks its units once; new records inherit them automatically.

**Settings on res.company** (7 Selection fields):
  • x_fc_default_temp_uom            — °F / °C
  • x_fc_default_thickness_uom       — mils / microns / inches / mm
  • x_fc_default_volume_uom          — US gal / litres / Imp gal
  • x_fc_default_mass_uom            — lb / kg / oz / g
  • x_fc_default_pressure_uom        — psi / bar / kPa
  • x_fc_default_current_density_uom — A/ft² (ASF) / A/dm² (ASD)
  • x_fc_default_area_uom            — sq in / sq ft / cm² / m²

All default to North-American aerospace conventions (F, mils, gal, lb,
psi, asf, sq_in) — admins flip them once during onboarding via
Settings → Fusion Plating → Units of Measure.

**Per-record use** (this round)
  • mrp.workorder.x_fc_bake_temp_uom (°F / °C) — defaults from company,
    operator can override per WO if a specific bake needs a different
    unit (rare but allowed).
  • Bake-finish gate error message now reports the actual unit:
    "Bake Temp (°F)" or "Bake Temp (°C)" instead of hard-coded F.
  • Form: Bake Temp + Temp Unit picker side-by-side in the bake group.

**Settings UI** — new "Units of Measure" block on Settings → Fusion
Plating page with help text per unit explaining where each is used.

**Verified end-to-end** (scripts/fp_uom_smoke.py):
  • All 7 defaults populate with NA-aerospace defaults
  • Switching company default to °C makes a NEW WO inherit °C
  • Existing WOs keep their stored °F (no surprise mutation)

**Roadmap (deferred to next round)** — wire the same default-from-company
inheritance to:
  • fp.bake.oven.target_temp (currently no UoM)
  • fp.bake.window.bake_temp (currently no UoM)
  • fp.coating.config.bake_temperature (currently no UoM)
  • fp.tank.volume already has volume_uom; default from company
  • fp.bath.log chemistry readings already use parameter.uom; align
    with company default for new params

The settings + framework are now in place — adding more per-record uom
fields is mechanical from here.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating/models/res_config_settings.py

@@ -25,3 +25,33 @@ class ResConfigSettings(models.TransientModel):
         readonly=False,
         string='Default Mastery Threshold',
     )
+
+    # ----- Unit-of-measure defaults --------------------------------------
+    x_fc_default_temp_uom = fields.Selection(
+        related='company_id.x_fc_default_temp_uom',
+        readonly=False, string='Temperature Unit',
+    )
+    x_fc_default_thickness_uom = fields.Selection(
+        related='company_id.x_fc_default_thickness_uom',
+        readonly=False, string='Thickness Unit',
+    )
+    x_fc_default_volume_uom = fields.Selection(
+        related='company_id.x_fc_default_volume_uom',
+        readonly=False, string='Volume Unit',
+    )
+    x_fc_default_mass_uom = fields.Selection(
+        related='company_id.x_fc_default_mass_uom',
+        readonly=False, string='Mass Unit',
+    )
+    x_fc_default_pressure_uom = fields.Selection(
+        related='company_id.x_fc_default_pressure_uom',
+        readonly=False, string='Pressure Unit',
+    )
+    x_fc_default_current_density_uom = fields.Selection(
+        related='company_id.x_fc_default_current_density_uom',
+        readonly=False, string='Current Density Unit',
+    )
+    x_fc_default_area_uom = fields.Selection(
+        related='company_id.x_fc_default_area_uom',
+        readonly=False, string='Area Unit',
+    )