Add tenant PWA help articles and links

docs/help/en/admin/event-branding-assets.md

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+---
+title: "Branding & Assets"
+locale: en
+slug: event-branding-assets
+audience: admin
+summary: "Upload logos, set colors, and manage the watermark for the guest experience."
+version_introduced: 2025.4
+requires_app_version: "^3.2.0"
+status: draft
+translation_state: aligned
+last_reviewed_at: 2026-01-23
+owner: onboarding@fotospiel.app
+related:
+  - slug: event-prep-checklist
+  - slug: tenant-dashboard-overview
+---
+
+## What you can change
+- **Cover image** and **logo** for the guest landing screen.
+- **Primary color** and **accent** for buttons and highlights.
+- **Welcome text** per locale.
+- **Watermark** settings for exported photos.
+
+## Recommended workflow
+1. Upload logo and cover image first.
+2. Adjust colors to match the event identity.
+3. Review the guest preview and adjust copy if needed.
+4. Configure watermark only if required by the contract.
+
+### Tips
+- Use high‑contrast colors for readability.
+- Keep welcome text short (1–2 sentences).
+
+### Need more help?
+See `event-prep-checklist` for the full prep flow or `tenant-dashboard-overview` for the status view.