fix(plating): chatter HTML rendering + workflow stage banner UX

Two fixes from a single SO walkthrough screenshot:

**1. "Current stage" banner**
- Was placed `inside sheet` so it rendered at the BOTTOM of the form
  where users miss it. Moved to `before form/header` (same xpath
  pattern as the Account Hold banner) — now it's the first thing
  visible above the SO header.
- Was still showing "Shipped — awaiting invoice" after the invoice
  was posted because `_compute_workflow_stage` only advanced to
  `complete` when shipped + ALL paid; an unpaid posted invoice left
  the SO stuck on `shipped`. Added an `invoicing` branch: shipped +
  has_posted_invoice → invoicing. Banner invisible-list now also
  includes `invoicing` and `paid`, so the banner only shows for
  in-progress steps.

**2. Chatter messages rendering raw HTML tags as text**
Odoo 19 escapes any string passed to `message_post(body=...)`
unless wrapped in `markupsafe.Markup`. We had ~10 places posting
HTML (`<a href>`, `<b>`, `<br/>`, `<code>`, `<pre>`) that all
showed up as `&lt;a href=...&gt;` literal text in the chatter.

Wrapped each one with `Markup(_(...))` so the tags render. Files
touched:

- fusion_plating_bridge_mrp/models/sale_order.py
  (auto-MO failure code block, "Draft MO created" link,
   "Job assigned to <b>" message)
- fusion_plating_bridge_mrp/models/mrp_production.py
  ("Recipe steps" pre/br block on each WO)
- fusion_plating_bridge_mrp/models/fp_proficiency.py
  (operator promotion announcement)
- fusion_plating_configurator/models/fp_quote_configurator.py
  (SO link, 3D model attached, drawing attached, save to catalog)
- fusion_plating_configurator/models/fp_part_catalog.py
  (3D/drawing change tracking + propagation to linked quotes)
- fusion_plating_portal/models/fp_quote_request.py
  (RFQ → SO link)
- fusion_plating_quality/models/fp_quality_hold.py
  (hold status change)
- fusion_plating_shopfloor/controllers/manager_controller.py
  (worker / tank / manager-takeover assignments)

Verified on entech: SO S00038 stage now reads `invoicing` (banner
hidden), and a freshly posted message shows `<a href>` and `<b>`
as actual link + bold instead of escaped text.

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

fusion_plating/scripts/fp_verify_fixes.py

@@ -0,0 +1,32 @@
+env = env  # noqa
+# Pick the SO we last tested
+so = env['sale.order'].search([('name', '=', 'S00038')], limit=1)
+if not so:
+    print('S00038 not found, picking last sale.order')
+    so = env['sale.order'].search([], order='id desc', limit=1)
+print(f'SO: {so.name}')
+print(f'  state: {so.state}')
+print(f'  invoice_status: {so.invoice_status}')
+print(f'  invoice_ids: {[(i.name, i.state, i.payment_state) for i in so.invoice_ids]}')
+print(f'  workflow_stage: {so.x_fc_workflow_stage}')
+print(f'  → BANNER VISIBLE? {so.x_fc_workflow_stage not in ("draft","invoicing","paid","complete","cancelled")}')
+
+# Post a fresh test message that exercises the new Markup path
+mo = env['mrp.production'].search([('origin', '=', so.name)], limit=1)
+if mo:
+    from markupsafe import Markup
+    so.message_post(body=Markup(
+        'TEST: Draft Manufacturing Order <a href="/odoo/manufacturing/%s">%s</a> '
+        'should render as a clickable link with <b>bold text</b>.'
+    ) % (mo.id, mo.name))
+    print(f'\\nposted test message on {so.name} referencing {mo.name}')
+
+# Check the latest 2 messages on the SO
+msgs = env['mail.message'].search([
+    ('model', '=', 'sale.order'), ('res_id', '=', so.id),
+], order='id desc', limit=3)
+print(f'\\nLast {len(msgs)} chatter messages on {so.name}:')
+for m in msgs:
+    body = (m.body or '')[:200]
+    print(f'  [{m.id}] {body!r}')
+env.cr.commit()