feat(fusion_repairs): Bundle 7 - tech mobile (T3 + T4 + T6 + T7)

T3 Labour timer on technician task
- Two new fields on fusion.technician.task: x_fc_timer_running_since
  (Datetime) + x_fc_timer_accumulated_minutes (Float).
- action_timer_start / action_timer_stop methods, idempotent (start when
  already running is a no-op, stop when not running is a no-op).
- Multiple start/stop cycles accumulate into the same total.
- Two header buttons (Start Timer green / Stop Timer amber), invisible
  based on the running_since field so the right one shows at any time.
- Stop posts a chatter line 'Labour timer stopped. Added X.X min, total
  Y.Y min.' so audit history shows every shift.

T4 Client signature on visit report
- New client_signature Binary field on the visit-report wizard with
  Odoo native widget='signature' that draws on canvas + base64-encodes
  the PNG.
- client_signature_name Char for typed name (audit).
- Persisted as an ir.attachment on the repair.order via the new
  _persist_mobile_artefacts helper.
- Chatter post 'Client signature captured (Jane Smith).'.

T6 Replaced parts - serial capture
- parts_serial_capture Text on the wizard (one per line per the spec).
- On confirm, posted to chatter wrapped in <pre> so line breaks survive.
- Used by OEM warranty filing in future M8.

T7 Client no-show photo proof
- no_show Boolean + no_show_photo Binary with widget='image' (visible
  only when no_show=True via Odoo 19 invisible= conditional).
- Photo saved as ir.attachment on the repair when present.
- Chatter post 'Visit recorded as client no-show (photo attached)'.

Verified end-to-end on local westin-v19:
  T3 timer started -> 2s sleep -> stopped -> 0.0357 min recorded
  T4 attachment 'signature-RO-202605-17.png' created on repair
  T6 chatter shows 'SN-AAA-111 / SN-BBB-222'
  T4 chatter shows 'Client signature captured (Jane Smith)'

Bumped to 19.0.1.7.0.

Co-authored-by: Cursor <cursoragent@cursor.com>

fusion_repairs/models/technician_task.py

@@ -42,6 +42,49 @@ class FusionTechnicianTaskRepairs(models.Model):
         copy=False,
     )
 
+    # ------------------------------------------------------------------
+    # T3 - Labour timer. The tech taps Start when they begin work and
+    # Stop when done; the accumulated minutes feeds the visit-report
+    # actual hours field. Multiple start/stop cycles are accumulated.
+    # ------------------------------------------------------------------
+    x_fc_timer_running_since = fields.Datetime(
+        string='Timer Running Since',
+        copy=False,
+    )
+    x_fc_timer_accumulated_minutes = fields.Float(
+        string='Accumulated Minutes',
+        default=0.0,
+        copy=False,
+        help='Total labour minutes captured by the tech timer. '
+             'Divide by 60 for the hours that prefill the visit report.',
+    )
+
+    def action_timer_start(self):
+        for t in self:
+            if t.x_fc_timer_running_since:
+                continue  # already running
+            t.x_fc_timer_running_since = fields.Datetime.now()
+            t.message_post(body=Markup(_('Labour timer <b>started</b>.')))
+
+    def action_timer_stop(self):
+        for t in self:
+            if not t.x_fc_timer_running_since:
+                continue
+            from datetime import datetime
+            elapsed_minutes = (
+                datetime.now() - t.x_fc_timer_running_since
+            ).total_seconds() / 60.0
+            t.x_fc_timer_accumulated_minutes = (
+                t.x_fc_timer_accumulated_minutes or 0.0
+            ) + elapsed_minutes
+            t.x_fc_timer_running_since = False
+            t.message_post(body=Markup(_(
+                'Labour timer <b>stopped</b>. Added %(mins).1f min, total %(tot).1f min.'
+            )) % {
+                'mins': elapsed_minutes,
+                'tot': t.x_fc_timer_accumulated_minutes or 0.0,
+            })
+
     def write(self, vals):
         """When a maintenance task transitions to 'completed', roll the
         linked contract to its next cycle. Failure to roll never blocks