feat: Contacts page + P360 for all tabs + dynamic column toggle + slot flicker fix

Contacts page:
 - New /contacts route — shows leads with source=PHONE/WALK_IN/REFERRAL
 - Leads page now excludes those sources (campaign-sourced only)
 - Sidebar: Contacts nav item added for all roles; Leads added for cc-agent
 - Same LeadTable + pagination + CSV export pattern as All Leads

P360 context panel for all worklist tabs (#6-10):
 - WorklistPanel: onSelectLead → onSelectItem (generic WorklistSelection)
 - call-desk: handleSelectItem builds ContextPanelSubject for any row type
 - ContextPanelSubject type replaces (lead as any).patientId casts
 - Highlight tracks row.id (mc-*/fu-*/lead-*) not lead.id

Dynamic column toggle (blank-screen fix):
 - missed-calls + call-recordings refactored to React Aria dynamic
   collections API (Table.Header columns={} + Table.Row columns={})
 - Fixes "Cell count must match column count" crash on column hide
 - Row-header column metadata in columnDefs instead of hardcoded JSX

Slot flickering fix (#2):
 - Removed clinic + timeSlot from slot-fetch useEffect deps (circular
   loop: effect sets clinic → clinic in deps → re-fires)
 - Memoized timeSlotSelectItems

Other:
 - GlobalSearch hidden (stale appointment state on navigation)
 - Branch column: shows campaign name from relation, falls back to DID
 - formatSource maps PHONE → "Phone"

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/call-desk/appointment-form.tsx

@@ -146,7 +146,12 @@ export const AppointmentForm = ({
                 setTimeSlotItems(autoItems);
             }
         }).catch(() => setTimeSlotItems([]));
-    }, [doctor, date, clinic, timeSlot]);
+    // eslint-disable-next-line react-hooks/exhaustive-deps — clinic and timeSlot
+    // deliberately excluded. Including clinic causes a loop: the effect calls
+    // setClinic() for auto-selection → clinic changes → effect re-fires → loop.
+    // timeSlot is only needed for the synthetic "current" option injection which
+    // is a read, not a trigger. Re-fetch should only happen on doctor/date change.
+    }, [doctor, date]);
 
     // Availability state
     const [bookedSlots, setBookedSlots] = useState<string[]>([]);
@@ -256,11 +261,11 @@ export const AppointmentForm = ({
         return items;
     }, [filteredDoctors, doctors, doctor]);
 
-    const timeSlotSelectItems = timeSlotItems.map(slot => ({
+    const timeSlotSelectItems = useMemo(() => timeSlotItems.map(slot => ({
         ...slot,
         isDisabled: bookedSlots.includes(slot.id),
         label: bookedSlots.includes(slot.id) ? `${slot.label} (Booked)` : slot.label,
-    }));
+    })), [timeSlotItems, bookedSlots]);
 
     const handleSave = async () => {
         if (!date || !timeSlot || !doctor || !department) {