feat: roll out illustrative empty states across 8 pages with 2 new guide entries

- TreeLibraryPage: split empty state into no-flows (illustration + CTA) vs no-filter-results
- MyAnalyticsPage/TeamAnalyticsPage: add zero-sessions empty state with illustration
- SessionHistoryPage: split into no-sessions (illustration) vs no-filter-results
- StepLibraryBrowser: illustrative empty state when no steps exist
- ScriptTemplateList: replace plain empty state with ScriptIllustration
- MySharesPage: replace icon-based empty state with ShareIllustration
- IntegrationsPage: add IntegrationIllustration above setup form
- Add script-templates and psa-setup guides to guides data
- Add EmptyState vitest tests (7 tests)

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

frontend/src/pages/account/IntegrationsPage.tsx

@@ -1,6 +1,8 @@
 import { useEffect, useState } from 'react'
 import { Plug, CheckCircle2, AlertCircle, Loader2, Pencil, Trash2, Shield, History, Ticket, Users, Zap, Save } from 'lucide-react'
 import { analytics } from '@/lib/analytics'
+import { EmptyState } from '@/components/common/EmptyState'
+import { IntegrationIllustration } from '@/components/common/EmptyStateIllustrations'
 import { PageMeta } from '@/components/common/PageMeta'
 import { integrationsApi } from '@/api/integrations'
 import type { PsaConnectionResponse, PsaConnectionCreate, PsaConnectionUpdate, PsaConnectionTestResponse } from '@/types'
@@ -254,6 +256,18 @@ export function IntegrationsPage() {
         {/* Connection Tab */}
         {activeTab === 'connection' && (
         <div className="max-w-3xl">
+          {/* Illustrative empty state when no connection exists */}
+          {mode === 'setup' && (
+            <div className="mb-6">
+              <EmptyState
+                illustration={<IntegrationIllustration />}
+                title="Connect your PSA for seamless workflows"
+                description="Link ConnectWise or other PSA tools to pull ticket context into sessions and push documentation back automatically."
+                learnMoreLink="/guides/psa-setup"
+              />
+            </div>
+          )}
+
           {/* Setup / Edit Form */}
           {(mode === 'setup' || mode === 'edit') && (
             <div className="glass-card-static p-6">