feat(mail): add mana-mail service and frontend module (Phase 1 MVP)

Backend: Hono/Bun service on port 3042 with JMAP client for Stalwart,
account provisioning (@mana.how addresses on user registration),
thread/message/send/label API endpoints, and JWT + service-key auth.

Frontend: Mail module with 3-column inbox UI (mailboxes, thread list,
detail/compose), local-first encrypted drafts in Dexie, and API-driven
thread fetching. Scoped CSS with theme tokens.

Integration: Dexie v11 schema, mail pgSchema in mana_platform,
mana-auth fire-and-forget hook for account provisioning,
getManaMailUrl() in API config, app registry + branding update.

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

packages/shared-branding/src/mana-apps.ts

@@ -824,6 +824,23 @@ export const MANA_APPS: ManaApp[] = [
 		// calls behind it are credit-gated server-side regardless.
 		requiredTier: 'guest',
 	},
+	{
+		id: 'meditate',
+		name: 'Meditate',
+		description: {
+			de: 'Meditation & Atemübungen',
+			en: 'Meditation & Breathing',
+		},
+		longDescription: {
+			de: 'Meditations-Timer, geführte Atemübungen (Box Breathing, 4-7-8, Wim Hof), Body Scans und Stimmungstracking. Finde deine Ruhe — mit Streak-Tracking und Session-Verlauf.',
+			en: 'Meditation timer, guided breathing exercises (Box Breathing, 4-7-8, Wim Hof), body scans, and mood tracking. Find your calm — with streak tracking and session history.',
+		},
+		icon: APP_ICONS.meditate,
+		color: '#8b5cf6',
+		comingSoon: false,
+		status: 'development',
+		requiredTier: 'guest',
+	},
 ];
 
 /**