fix(digest): replace hardcoded #7161FF with {{brandAccent}}

Lines 8 and 22 of digest.mjml hardcoded #7161FF for the event-item
border-left and footer link color, while mailer.ts already passes
brandAccent into the template (used at lines 15 and 34). When
BRAND_ACCENT is customized, the border and footer links stayed the
default purple.

Drive both from {{brandAccent}} so they respect the customization.

Fixes bead mailship-hu5

src/emails/digest.mjml

@@ -5,7 +5,7 @@
     <mj-style inline="inline">
       .header { font-family: Inter, Helvetica, Arial, sans-serif; font-size: 24px; font-weight: 700; }
       .subheader { font-family: Inter, Helvetica, Arial, sans-serif; font-size: 15px; color: #64748b; line-height: 1.5; }
-      .event-item { margin-bottom: 20px; border-left: 3px solid #7161FF; padding-left: 12px; }
+      .event-item { margin-bottom: 20px; border-left: 3px solid {{brandAccent}}; padding-left: 12px; }
       .event-meta { margin-bottom: 8px; display: flex; justify-content: space-between; align-items: center; }
       .event-meta-left { display: flex; align-items: center; }
       .event-author { font-family: Inter, Helvetica, Arial, sans-serif; font-weight: 600; margin-right: 4px; color: #1e293b; }
@@ -19,7 +19,7 @@
       .event-stats { margin-top: 8px; color: #64748b; font-size: 13px; }
       .stat-item { display: inline-flex; align-items: center; margin-right: 12px; }
       .footer { font-family: Inter, Helvetica, Arial, sans-serif; color: #94a3b8; font-size: 12px; line-height: 1.5; }
-      .footer a { color: #7161FF; text-decoration: underline; }
+      .footer a { color: {{brandAccent}}; text-decoration: underline; }
       .logo { max-width: 48px; max-height: 48px; }
       a { text-decoration: none; }
     </mj-style>

test/digest-template.test.js

@@ -0,0 +1,74 @@
+#!/usr/bin/env node
+// FAILING test: digest.mjml hardcodes #7161FF instead of using {{brandAccent}}
+//
+// The bug: in src/emails/digest.mjml line 8 and line 22, the CSS for
+// .event-item border-left and .footer a color hardcode #7161FF even though
+// {{brandAccent}} is passed into the template by mailer.ts and used
+// elsewhere (lines 15, 34). When BRAND_ACCENT is customized, the event-item
+// border and footer links stay the default purple.
+//
+// The fix: replace both hardcoded #7161FF values with {{brandAccent}}.
+
+import { readFileSync } from 'fs';
+import { fileURLToPath } from 'url';
+import { dirname, join } from 'path';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const templatePath = join(__dirname, '..', 'src', 'emails', 'digest.mjml');
+
+let passed = 0;
+let failed = 0;
+
+function assert(label, ok, detail) {
+  if (ok) {
+    console.log(`  ✓ ${label}`);
+    passed++;
+  } else {
+    console.log(`  ✗ ${label} — ${detail || ''}`);
+    failed++;
+  }
+}
+
+// Read the MJML template
+const source = readFileSync(templatePath, 'utf8');
+const lines = source.split('\n');
+
+console.log('1. No hardcoded #7161FF in .event-item or .footer a CSS');
+
+// Check .event-item border-left doesn't have #7161FF
+const eventItemLineIdx = lines.findIndex(l => l.includes('.event-item'));
+const hasEventItemHardcoded = lines.some(l => l.includes('.event-item') && l.includes('#7161FF'));
+assert(
+  '.event-item border-left does NOT hardcode #7161FF',
+  !hasEventItemHardcoded,
+  hasEventItemHardcoded ? `Line ${eventItemLineIdx + 1} still has #7161FF: "${lines[eventItemLineIdx].trim()}"` : ''
+);
+
+// Check .footer a color doesn't have #7161FF
+const footerAIdx = lines.findIndex(l => l.includes('.footer a'));
+const hasFooterHardcoded = lines.some(l => l.includes('.footer a') && l.includes('#7161FF'));
+assert(
+  '.footer a color does NOT hardcode #7161FF',
+  !hasFooterHardcoded,
+  hasFooterHardcoded ? `Line ${footerAIdx + 1} still has #7161FF: "${lines[footerAIdx].trim()}"` : ''
+);
+
+// Check .event-item border-left uses {{brandAccent}}
+const eventItemLine = lines[eventItemLineIdx];
+assert(
+  '.event-item border-left uses {{brandAccent}}',
+  eventItemLine && eventItemLine.includes('{{brandAccent}}'),
+  eventItemLine ? `Line ${eventItemLineIdx + 1}: "${eventItemLine.trim()}"` : '.event-item line not found'
+);
+
+// Check .footer a color uses {{brandAccent}}
+const footerALine = lines[footerAIdx];
+assert(
+  '.footer a color uses {{brandAccent}}',
+  footerALine && footerALine.includes('{{brandAccent}}'),
+  footerALine ? `Line ${footerAIdx + 1}: "${footerALine.trim()}"` : '.footer a line not found'
+);
+
+console.log('');
+console.log(`Results: ${passed} passed, ${failed} failed`);
+process.exit(failed > 0 ? 1 : 0);