feat: wizard step indicator, wider dialog, campaigns in admin sidebar, clear leads shortcut

- Import wizard: added step indicator (numbered circles), widened to max-w-5xl
- Admin sidebar: added Marketing → Campaigns nav link
- Clear campaign leads: Ctrl+Shift+C shortcut with campaign picker modal (test-only)
- Test CSV data for all 3 campaigns
- Defect fixing plan + CSV import spec docs
- Session memory update

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

src/hooks/use-maint-shortcuts.ts

@@ -27,6 +27,11 @@ const MAINT_ACTIONS: Record<string, MaintAction> = {
         label: 'Fix Timestamps',
         description: 'Correct call timestamps that were stored with IST double-offset.',
     },
+    clearCampaignLeads: {
+        endpoint: '__client__clear-campaign-leads',
+        label: 'Clear Campaign Leads',
+        description: 'Delete all imported leads from a selected campaign. For testing only.',
+    },
 };
 
 export const useMaintShortcuts = () => {
@@ -61,6 +66,10 @@ export const useMaintShortcuts = () => {
                 e.preventDefault();
                 openAction(MAINT_ACTIONS.fixTimestamps);
             }
+            if (e.ctrlKey && e.shiftKey && e.key === 'C') {
+                e.preventDefault();
+                openAction(MAINT_ACTIONS.clearCampaignLeads);
+            }
         };
 
         window.addEventListener('keydown', handler);