feat(fusion_plating_jobs): de-rack/bake area_kind name override + rack-load Phase 1

- _compute_area_kind: name-based override so de-rack/de-mask steps land in the
  De-Racking column and bake/oven steps in Baking, regardless of a mis-tagged
  recipe kind (fixed WO cards scattering into the wrong shop-floor columns).
- fp.rack.load jobs extension: racking-step resolution by area_kind (not the
  corrupt kind), equal-split/override ops, fp.job qty_racked/unracked rollups,
  and independent rack movement (per-line moves) + de-racking unrack.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating_jobs/models/fp_job_step.py

@@ -128,34 +128,83 @@ class FpJobStep(models.Model):
     @api.depends(
         'work_centre_id.area_kind',
         'recipe_node_id.kind_id.area_kind',
+        'name',
     )
     def _compute_area_kind(self):
         """Resolve the plant-view column this step belongs in.
 
         Priority chain:
-          1. work_centre.area_kind (explicit operator setup wins)
-          2. recipe_node.kind_id.area_kind (kind taxonomy authoritative)
-          3. catch-all 'plating' (data integrity issue if we land here)
+          1. name-based override for unambiguous de-rack / de-mask steps
+             (2026-06-03): their recipe kind AND/OR work-centre is
+             frequently wrong (tagged 'racking'/'mask', a shared station,
+             or left blank), which scattered de-racking cards across the
+             Racking / Masking / Plating columns. The operator-facing step
+             NAME is unambiguous for these, so it wins OUTRIGHT — even over
+             an explicit work-centre. Bake/oven steps that merely mention
+             "de-rack" in their name are excluded so they stay in Baking.
+          2. work_centre.area_kind (explicit operator setup)
+          3. recipe_node.kind_id.area_kind (kind taxonomy authoritative)
+          4. catch-all 'plating' (data integrity issue if we land here)
 
-        The legacy _STEP_KIND_TO_AREA dict was removed — fp.step.kind
-        now self-declares its area_kind, so the kind taxonomy IS the
-        source of truth. See spec
+        The kind taxonomy remains the source of truth for every area
+        EXCEPT de-rack/de-mask (step 1). See spec
         2026-05-24-shopfloor-live-step-fix-design.md Change 6.
         """
         for step in self:
-            # 1. Explicit work_centre wins
+            # 1. Name override (de-rack/de-mask -> De-Racking, bake/oven ->
+            #    Baking) — unambiguous; the authored kind / work-centre is
+            #    frequently wrong/blank for these. See _fp_area_from_step_name.
+            name_area = self._fp_area_from_step_name(step.name)
+            if name_area:
+                step.area_kind = name_area
+                continue
+            # 2. Explicit work_centre setup
             if step.work_centre_id and step.work_centre_id.area_kind:
                 step.area_kind = step.work_centre_id.area_kind
                 continue
-            # 2. Kind taxonomy
+            # 3. Kind taxonomy
             node = step.recipe_node_id
             if node and node.kind_id and node.kind_id.area_kind:
                 step.area_kind = node.kind_id.area_kind
                 continue
-            # 3. Catch-all — only reached for orphaned steps (no
+            # 4. Catch-all — only reached for orphaned steps (no
             # work_centre AND no recipe_node).
             step.area_kind = 'plating'
 
+    @staticmethod
+    def _fp_area_from_step_name(name):
+        """Unambiguous step-name -> area_kind override (area or None).
+
+        The recipe kind is frequently wrong/blank for these step types, so
+        the operator-facing NAME is the more reliable signal and wins over
+        kind/work-centre in _compute_area_kind:
+
+          - bake / oven -> 'baking'  (checked FIRST so "Oven bake (Post
+            de-rack)" counts as a bake, not a de-rack). Excludes
+            inspection-of-bake names ("post-bake inspection/QC/test") and
+            part-number / generic references ("General Processing -
+            BAKE-K464034") so only real bake operations move.
+          - de-rack / de-mask -> 'de_racking'.
+
+        Everything else returns None so the normal work-centre / kind /
+        fallback chain applies.
+        """
+        x = (name or '').strip().lower()
+        if not x:
+            return None
+        # bake / oven first — a "post de-rack" oven bake IS a bake
+        if 'oven' in x or 'bake' in x:
+            if any(w in x for w in (
+                    'processing', 'inspect', 'check', 'qc',
+                    'test', 'verif', 'review')):
+                return None
+            return 'baking'
+        # de-rack / de-mask
+        flat = x.replace('-', '').replace('_', '').replace(' ', '')
+        if 'derack' in flat or 'demask' in flat:
+            return 'de_racking'
+        return None
+
     last_activity_at = fields.Datetime(
         string='Last Activity',
         index=True,