✨ feat: add new contact form, hero, features, and richtext blocks; implement scroll-reveal action and update styles

- Introduced ContactFormBlock, FeaturesBlock, HeroBlock, and RichtextBlock components.
- Implemented a scroll-reveal action for animations on element visibility.
- Enhanced CSS styles for better theming and prose formatting.
- Added localization support for new components and updated existing translations.
- Created e2e tests for demo pages including contact form validation and navigation.
- Added a video tour showcasing the demo pages and interactions.

api/collections/navigation.yml

@@ -0,0 +1,68 @@
+########################################################################
+# Navigation collection — header and footer navigation entries
+########################################################################
+
+name: navigation
+meta:
+  label: { de: "Navigation", en: "Navigation" }
+  muiIcon: menu
+  rowIdentTpl: { twig: "{{ type }} ({{ language }})" }
+
+  views:
+    - type: simpleList
+      mediaQuery: "(max-width: 600px)"
+      primaryText: type
+      secondaryText: language
+    - type: table
+      columns:
+        - source: type
+          filter: true
+        - source: language
+          filter: true
+
+permissions:
+  public:
+    methods:
+      get: true
+  user:
+    methods:
+      get: true
+      post: true
+      put: true
+      delete: true
+
+fields:
+  - name: language
+    type: string
+    meta:
+      label: { de: "Sprache", en: "Language" }
+  - name: type
+    type: string
+    meta:
+      label: { de: "Typ", en: "Type" }
+      helperText: { de: "header oder footer", en: "header or footer" }
+  - name: elements
+    type: object[]
+    meta:
+      label: { de: "Elemente", en: "Elements" }
+    subFields:
+      - name: name
+        type: string
+        meta:
+          label: { de: "Bezeichnung", en: "Label" }
+      - name: page
+        type: string
+        meta:
+          label: { de: "Seite (Content-ID)", en: "Page (Content ID)" }
+      - name: external
+        type: boolean
+        meta:
+          label: { de: "Externer Link", en: "External Link" }
+      - name: externalUrl
+        type: string
+        meta:
+          label: { de: "Externe URL", en: "External URL" }
+      - name: hash
+        type: string
+        meta:
+          label: { de: "Anker", en: "Anchor" }