fix(jobs): workflow state — chatter + field cycle fix + force view reload

Three issues from user testing on entech:

1. RPC error: column fp_step_template.triggers_workflow_state_id
   does not exist
   Root cause: the field was declared in fusion_plating CORE, but
   its target model fp.job.workflow.state lives in fusion_plating_jobs.
   Odoo loads core BEFORE jobs (jobs depends on core), so when core's
   field declaration runs, the comodel doesn't exist yet — and Odoo
   silently skips creating the column.
   Fix: moved the field to fusion_plating_jobs/models/fp_job.py via
   _inherit. Now the column is added when jobs loads (after core),
   and the FK target is resolvable.

2. No chatter on the Workflow State form
   Added _inherit = ['mail.thread', 'mail.activity.mixin'] to
   fp.job.workflow.state. Tracking enabled on name/code/sequence so
   admins see who changed the milestone vocabulary. <chatter/> widget
   added to the form view.

3. Form layout still showed cramped 2-col help text
   The XML file on disk had my new alert-info card, but Odoo's DB
   ir_ui_view still held the old arch. The -u didn't refresh it
   (likely because the file's mtime didn't change between deploys).
   Fix: bump version + the next deploy will run a SQL DELETE on the
   ir_ui_view record so Odoo recreates it from XML on -u.

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

fusion_plating/fusion_plating_jobs/__manifest__.py

@@ -3,7 +3,7 @@
 # License OPL-1 (Odoo Proprietary License v1.0)
 {
     'name': 'Fusion Plating — Native Jobs',
-    'version': '19.0.8.18.3',
+    'version': '19.0.8.18.4',
     'category': 'Manufacturing/Plating',
     'summary': 'Native plating job model — replaces mrp.production / mrp.workorder bridge.',
     'author': 'Nexa Systems Inc.',