feat(fusion_repairs): Bundle 3 - reminders + upsells (X2 + X4 + M3)

X2 Day-before visit reminder email
- New cron 'Fusion Repairs: Day-before visit reminders' (daily at 08:00)
  walks repair.order records with at least one linked
  fusion.technician.task scheduled for tomorrow and not yet reminded.
- Sends mail.template email_template_visit_day_before to the client.
- New x_fc_day_before_reminder_sent flag (copy=False) so the cron
  never re-sends the same reminder.
- Template uses 4px blue accent, 600px max-width, shows the scheduled
  date + technician name + equipment, with a 'reply to reschedule' note.
- Verified: cron flagged the test repair x_fc_day_before_reminder_sent=True
  after running.

X4 Post-visit NPS / Google review email
- New cron 'Fusion Repairs: Send post-visit NPS emails' (hourly)
  finds repairs in state='done' with write_date >= 24h ago and no NPS
  email sent. Sends mail.template email_template_post_visit_nps.
- New x_fc_nps_email_sent flag so we never re-pester clients.
- Template uses 4px green accent + 'Leave a Google review' CTA button
  linking to res.company.x_fc_google_review_url (or a sensible Google
  search fallback when the company hasn't configured a review URL).

M3 Loaner auto-offer for long-running repairs
- Soft-bridges fusion_loaners_management without a hard dep -
  cron_offer_loaner_for_long_repairs returns immediately if the
  fusion.loaner.checkout model isn't installed.
- Walks repair.order records open longer than
  fusion_repairs.loaner_offer_threshold_days (ICP, default 3 days)
  with no existing loaner-offer activity.
- Posts a 'Repair: Offer Loaner' activity (new mail.activity.type)
  assigned to the repair responsible.
- New x_fc_loaner_offered flag to prevent daily re-posting.
- Manual 'Offer Loaner' button on repair header opens the
  fusion.loaner.checkout wizard pre-filled with partner + SO.
- Daily cron runs at 08:30.

Email + ICP + cron wiring:
- 2 new mail.template records (visit_day_before, post_visit_nps)
- 1 new mail.activity.type (loaner_offer)
- 3 new ir.cron records (day-before, NPS, loaner)
- 1 new ir.config_parameter (loaner_offer_threshold_days)
- 1 new header button (Offer Loaner) on repair.order

Verified end-to-end on local westin-v19:
  X2 setup repair: RO-202605-12 task: TASK-00045
     day-before flag after cron: True (expected True)
  M3 loaner model not installed - cron correctly no-op'd
  (no flag set, no activity posted, no error - the soft-dep guard works)

Bumped to 19.0.1.3.0.

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

fusion_repairs/views/repair_order_views.xml

@@ -24,6 +24,13 @@
                         class="btn-secondary"
                         invisible="state != 'done'"
                         groups="fusion_repairs.group_fusion_repairs_user"/>
+                <button name="action_offer_loaner"
+                        type="object"
+                        string="Offer Loaner"
+                        class="btn-secondary"
+                        icon="fa-handshake-o"
+                        invisible="state in ('done', 'cancel')"
+                        groups="fusion_repairs.group_fusion_repairs_user"/>
             </xpath>
 
             <!-- Smart buttons: Technician Tasks + Intake Answers + Original SO. -->