Mobile Phase 8f: Pipeline card → dc anatomy (earmark/Priority/recency, scroll pills, dots)

Bring the mobile Pipeline surface to the PipelineApp.dc.html default anatomy:

- Segmented control → horizontal-scroll pills with label + count badge; the active
  pill tints to its own stage color via --seg-* (aliased to --chip-*, so it flips in light).
- Card → earmark corner + name + Priority pill / $amount · dot · recency / labeled
  ‹ Prev · Next › move footer (was name + contact·org sub + bare chevrons). Compact amount.
- Stage-column header → StageChip + investor count + committed sum.
- Page dots → tappable, active = 22px accent bar.

Backend: the opportunities list injects two derived read-only fields (mirroring the
Contacts-list pattern; opp writes use a field allowlist so neither round-trips):
- existing_investor (contact_grid_signals committed>0) so the card earmark agrees with
  the detail's "Existing LP" pill.
- last_contact_date (MAX communication_date on the deal's contact, deleted_at-filtered)
  → card recency line + the Staleness sort (replaces the updated_at proxy).

Guarded by new soft-delete assertions in test_soft_delete_reads.py. 39/39 green.

backend/server.py

@@ -3014,7 +3014,9 @@ class CRMHandler(BaseHTTPRequestHandler):
         conn = get_db()
         query = """
             SELECT op.*, c.first_name, c.last_name, c.email as contact_email,
-                   o.name as organization_name, u.full_name as owner_name
+                   o.name as organization_name, u.full_name as owner_name,
+                   (SELECT MAX(communication_date) FROM communications
+                     WHERE contact_id = op.contact_id AND deleted_at IS NULL) as last_contact_date
             FROM opportunities op
             LEFT JOIN contacts c ON op.contact_id = c.id
             LEFT JOIN organizations o ON op.organization_id = o.id
@@ -3047,6 +3049,16 @@ class CRMHandler(BaseHTTPRequestHandler):
         args.extend([limit, offset])
 
         opps = rows_to_list(conn.execute(query, args).fetchall())
+        # Read-only existing-LP signal for the mobile Pipeline card earmark (8f): the deal's linked
+        # contact rolls up to a grid investor with committed capital. Same source as the Contacts
+        # list's `committed` and the detail sheet's "Existing LP" pill (contact_grid_signals →
+        # committed > 0), so card earmark and detail pill agree. Derived on GET, never persisted;
+        # opportunity writes use a field allowlist (handle_update_opportunity) so it can't round-trip.
+        # `last_contact_date` (subselect above) drives the card recency line + the Staleness sort.
+        signals = contact_grid_signals(conn)
+        for op in opps:
+            sig = signals.get(str(op.get('contact_id') or ''))
+            op['existing_investor'] = bool(sig and sig['committed'] > 0)
         conn.close()
         return self.send_json({"data": opps, "total": total, "limit": limit, "offset": offset})