feat(fusion_repairs): Bundle 6 - M7 failure analytics + M9 margin per repair

M9 margin per repair
- New non-stored computes on repair.order: x_fc_revenue, x_fc_labour_cost,
  x_fc_parts_cost, x_fc_margin, x_fc_margin_pct.
- Revenue: sum of posted out_invoice.amount_untaxed on the repair's sale
  order (handles partial / multi invoice scenarios).
- Labour: sum of (task.duration_hours x technician.x_fc_tech_cost_rate)
  over COMPLETED visits only - avoids counting scheduled-but-not-done time.
- Parts: sum of standard_price x qty for stock moves where
  repair_line_type='add' (parts consumed, not removed).
- New 'Margin' notebook tab on repair.order form, manager-group gated.

M7 failure analytics on the dashboard
- Three new keys in get_dashboard_data():
  * failures_by_product - top 8 products by repair_count in last 90 days
    via _read_group (efficient - no record load)
  * failures_by_symptom - top 8 x_fc_issue_category values
  * margin_summary - revenue/labour/parts/margin/margin_pct + sample_size
    over the same 90-day window
- Three new tiles on the OWL dashboard 'Last 90 Days' section:
  Margin Summary (revenue/labour/parts/margin breakdown),
  Failure Rate by Product, Failure Rate by Symptom.
- New formatMoney + formatPercent helpers on the dashboard JS so values
  display as 'CAD 12,345' rather than raw floats.

Verified end-to-end on local westin-v19:
  Dashboard returned all 9 expected keys.
  Top product: 'M6 X 27 THREADED BARREL' (2 repairs) - actual test data.
  Margin summary over 26 repairs (dev has $0 invoices so values 0.0,
  but the compute path is exercised and shapes are correct).

Bumped to 19.0.1.6.0.

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

fusion_repairs/models/repair_dashboard.py

@@ -9,7 +9,7 @@ recent activity, and upcoming maintenance. Lives as an AbstractModel
 because it stores nothing - all values are computed on demand.
 """
 
-from datetime import timedelta
+from datetime import datetime, timedelta
 
 from odoo import api, fields, models
 
@@ -121,6 +121,61 @@ class FusionRepairDashboard(models.AbstractModel):
             'sales_rep_portal_url': base_url + '/my/repair/new',
         }
 
+        # ---------------- M7: failure-rate analytics ----------------
+        # Top products by repair count in the last 90 days (excludes draft).
+        ninety = datetime.now() - timedelta(days=90)
+        failure_rows = Repair._read_group(
+            [
+                ('create_date', '>=', ninety),
+                ('product_id', '!=', False),
+                ('state', '!=', 'cancel'),
+            ],
+            ['product_id'],
+            ['__count'],
+            order='__count desc',
+            limit=8,
+        )
+        failures_by_product = [{
+            'product_id': p.id,
+            'product_name': p.display_name,
+            'repair_count': c,
+        } for p, c in failure_rows]
+
+        # Top symptom categories (issue_category) in the last 90 days.
+        symptom_rows = Repair._read_group(
+            [
+                ('create_date', '>=', ninety),
+                ('x_fc_issue_category', '!=', False),
+                ('state', '!=', 'cancel'),
+            ],
+            ['x_fc_issue_category'],
+            ['__count'],
+            order='__count desc',
+            limit=8,
+        )
+        failures_by_symptom = [{
+            'symptom': s or 'Other',
+            'repair_count': c,
+        } for s, c in symptom_rows]
+
+        # M9: margin summary (open + done in the last 90 days).
+        margin_rows = self.env['repair.order'].search([
+            ('create_date', '>=', ninety),
+            ('state', '!=', 'cancel'),
+        ])
+        total_revenue = sum(margin_rows.mapped('x_fc_revenue'))
+        total_labour = sum(margin_rows.mapped('x_fc_labour_cost'))
+        total_parts = sum(margin_rows.mapped('x_fc_parts_cost'))
+        total_margin = total_revenue - total_labour - total_parts
+        margin_summary = {
+            'revenue': total_revenue,
+            'labour_cost': total_labour,
+            'parts_cost': total_parts,
+            'margin': total_margin,
+            'margin_pct': (total_margin / total_revenue * 100) if total_revenue else 0.0,
+            'sample_size': len(margin_rows),
+        }
+
         return {
             'stats': stats,
             'urgency_breakdown': urgency_breakdown,
@@ -128,4 +183,7 @@ class FusionRepairDashboard(models.AbstractModel):
             'recent': recent,
             'upcoming': upcoming,
             'portals': portals,
+            'failures_by_product': failures_by_product,
+            'failures_by_symptom': failures_by_symptom,
+            'margin_summary': margin_summary,
         }