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/pages/all-leads.tsx

@@ -52,8 +52,13 @@ export const AllLeadsPage = () => {
     const statusFilter: LeadStatus | undefined = tab === 'new' ? 'NEW' : undefined;
     const myLeadsOnly = tab === 'my-leads';
 
+    // Exclude organic contact sources — those live on the Contacts page.
+    // Leads page shows campaign-sourced / marketing-qualified leads only.
+    const CONTACT_SOURCES = useMemo(() => new Set(['PHONE', 'WALK_IN', 'REFERRAL'] as const), []);
+
     const { leads: filteredLeads, total, updateLead } = useLeads({
         source: sourceFilter ?? undefined,
+        excludeSources: CONTACT_SOURCES,
         status: statusFilter,
         search: searchQuery || undefined,
     });