fix: Lead Master pagination — PAGE_SIZE 25→15, LeadTable flex chain for scroll

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

src/components/leads/lead-table.tsx

@@ -115,7 +115,7 @@ export const LeadTable = ({
         : allColumns;
 
     return (
-        <div className="overflow-hidden rounded-xl ring-1 ring-secondary">
+        <div className="flex flex-1 flex-col min-h-0 overflow-hidden rounded-xl ring-1 ring-secondary">
             <Table
                 aria-label="Leads table"
                 selectionMode="multiple"

src/pages/all-leads.tsx

@@ -34,7 +34,7 @@ type ActiveFilter = {
     value: string;
 };
 
-const PAGE_SIZE = 25;
+const PAGE_SIZE = 15;
 
 export const AllLeadsPage = () => {
     const { user } = useAuth();