fix: P1 defect batch — hide Decline button, remove No Campaign pill, remove Remind column

- active-call-card: Decline button hidden (reject returns call to
  Ozonetel queue, product says not needed for now)
- all-leads: removed "No Campaign" pill and __none__ filter logic
- appointments-v2: removed REMIND column header + cell + unused
  handleSendReminder, isUpcoming, buildReminderMessage, formatDateTime

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

src/pages/all-leads.tsx

@@ -146,9 +146,7 @@ export const AllLeadsPage = () => {
             result = result.filter((l) => l.assignedAgent === user.name);
         }
         if (campaignFilter) {
-            result = campaignFilter === '__none__'
-                ? result.filter((l) => !l.campaignId)
-                : result.filter((l) => l.campaignId === campaignFilter);
+            result = result.filter((l) => l.campaignId === campaignFilter);
         }
         return result;
     }, [sortedLeads, myLeadsOnly, user.name, campaignFilter]);
@@ -320,17 +318,6 @@ export const AllLeadsPage = () => {
                                 </button>
                             );
                         })}
-                        <button
-                            onClick={() => { setCampaignFilter(campaignFilter === '__none__' ? null : '__none__'); setCurrentPage(1); }}
-                            className={cx(
-                                'shrink-0 rounded-full px-3 py-1 text-xs font-medium transition duration-100 ease-linear',
-                                campaignFilter === '__none__'
-                                    ? 'bg-brand-solid text-white'
-                                    : 'bg-secondary text-tertiary hover:text-secondary hover:bg-secondary_hover',
-                            )}
-                        >
-                            No Campaign ({filteredLeads.filter(l => !l.campaignId).length})
-                        </button>
                     </div>
                 )}