feat(fusion_plating_jobs): fp.job.display_wo_name compute (WO # 00001)

Plan task P1.1. Formats fp.job.name as "WO # <last-segment>" for
tablet/dashboard surfaces. Underlying name field is unchanged so
back-office forms, reports, and emails keep WH/JOB/00001.

Tests not run locally — fusion_plating not mounted in odoo-modsdev
container. Verify on entech: -u fusion_plating_jobs --test-tags fp_jobs.

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

fusion_plating/fusion_plating_jobs/models/fp_job.py

@@ -97,6 +97,30 @@ class FpJob(models.Model):
              'idempotency. Cleared post-cutover.',
     )
 
+    # Display formatter — "WO # 00001" used everywhere on tablet/dashboard.
+    # The underlying `name` field stays untouched (WH/JOB/00001) so reports,
+    # emails, and back-office forms continue using their canonical name.
+    # System-wide sequence rename is a separate decision (see spec
+    # 2026-05-22-shopfloor-tablet-redesign-design §6.5).
+    display_wo_name = fields.Char(
+        compute='_compute_display_wo_name',
+        string='WO #',
+        help='Tablet/dashboard formatter — "WO # 00001" derived from name. '
+             'Underlying name field is unchanged.',
+    )
+
+    @api.depends('name')
+    def _compute_display_wo_name(self):
+        for job in self:
+            raw = (job.name or '').strip()
+            if not raw:
+                job.display_wo_name = ''
+                continue
+            # Take the last "/"-separated segment as the number portion.
+            # WH/JOB/00001 → 00001 ; WH/JOB/2026/00042 → 00042 ; 00123 → 00123
+            tail = raw.rsplit('/', 1)[-1]
+            job.display_wo_name = f'WO # {tail}'
+
     # ------------------------------------------------------------------
     # Sub 14 — Configurable workflow state (status bar milestone)
     # ------------------------------------------------------------------