Remove page subtitles from all dashboard pages

Subtitles added noise without value. Stripped subtitle props from all 8
PageHeader calls, removed subtitle display from TopBar, and simplified
the PageTitleContext and PageHeader interfaces to title-only.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/(dashboard)/accounts/page.tsx

@@ -659,7 +659,7 @@ export default function AccountExplorer() {
 
   return (
     <div>
-      <PageHeader title="Account Explorer" subtitle="Tell me everything about this account" />
+      <PageHeader title="Account Explorer" />
 
       {/* KPI Summary Cards */}
       <div className="grid grid-cols-2 sm:grid-cols-3 lg:grid-cols-6 gap-3 mb-4">

src/app/(dashboard)/activity/page.tsx

@@ -174,7 +174,7 @@ export default function ActivityDeepDive() {
 
   return (
     <div>
-      <PageHeader title="Activities" subtitle="Are we doing the right activities at the right volume?" />
+      <PageHeader title="Activities" />
 
       {/* Type filter chips */}
       <div className="flex flex-wrap gap-2 mb-4">

src/app/(dashboard)/goals/page.tsx

@@ -120,7 +120,7 @@ export default function GoalsPage() {
 
   return (
     <div className="space-y-6">
-      <PageHeader title="Goals & Targets" subtitle="Set and track district performance targets" />
+      <PageHeader title="Goals & Targets" />
 
       <div className="flex items-center gap-3">
         <label className="text-sm font-medium text-muted">Quarter</label>

src/app/(dashboard)/implementation/page.tsx

@@ -62,7 +62,7 @@ export default function ImplementationOutcomes() {
 
   return (
     <div>
-      <PageHeader title="Implementation & Outcomes" subtitle="Are closed deals going live and becoming references?" />
+      <PageHeader title="Implementation & Outcomes" />
 
       {/* Health Summary */}
       <div className="grid grid-cols-3 gap-3 mb-6">

src/app/(dashboard)/page.tsx

@@ -113,7 +113,7 @@ export default function ExecutiveOverview() {
 
   return (
     <div>
-      <PageHeader title="Executive Overview" subtitle="Are we on track for a successful launch?" />
+      <PageHeader title="Executive Overview" />
 
       <div className="grid grid-cols-2 sm:grid-cols-3 lg:grid-cols-7 gap-3 mb-6">
         <Scorecard label="Total Accounts" value={kpis.totalAccounts} />

src/app/(dashboard)/pipeline/page.tsx

@@ -180,7 +180,7 @@ export default function PipelineDeepDive() {
 
   return (
     <div>
-      <PageHeader title="Pipeline Deep Dive" subtitle="Where is the money and will it close?" />
+      <PageHeader title="Pipeline Deep Dive" />
 
       <div className="flex justify-end mb-2">
         <ExportButton table="pipeline" />

src/app/(dashboard)/playbooks/page.tsx

@@ -132,7 +132,7 @@ export default function PlaybooksPage() {
             <svg className="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><polyline points="15 18 9 12 15 6" /></svg>
             Back
           </button>
-          <PageHeader title={selectedPlaybook.play_name} subtitle={selectedPlaybook.description || 'Campaign playbook'} />
+          <PageHeader title={selectedPlaybook.play_name} />
         </div>
 
         {editing ? (
@@ -221,7 +221,7 @@ export default function PlaybooksPage() {
 
   return (
     <div className="space-y-6">
-      <PageHeader title="Campaign Playbooks" subtitle="Standardized sales plays and account progress tracking" />
+      <PageHeader title="Campaign Playbooks" />
 
       <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-4">
         {playbooks.map(pb => {