Add ToDo-Karten product page, fluid design tokens, and Navbar/Hero fixes

New /todo-cards page (Hero, How-it-works, Focus, Testimonials, Pricing)
built with the fluid clamp() token system (app/lib/fluid.ts) and
scroll-reveal animations (app/components/Reveal.tsx), matching styling
consistency with /challenge's testimonial section.

Navbar: page-aware active state and anchor-link navigation from any
route (not just "/"), fixed logo click to actually navigate instead of
silently rewriting the URL, fluid nav text size, custom hash-scroll
handling for cross-page anchor links.

Hero: responsive breakpoint fix for the text/image split at Tablet
widths, entrance animation for the brand's orange dot, removed a red
dot artifact from hero.png.

Also includes prior uncommitted work on About/Blog/Newsletter/Footer
and the cart lib (app/lib/cart.ts).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package-lock.json

@@ -8,6 +8,7 @@
       "name": "einfach-produktiv",
       "version": "0.1.0",
       "dependencies": {
+        "motion": "^12.42.2",
         "next": "16.2.9",
         "react": "19.2.4",
         "react-dom": "19.2.4"
@@ -3795,6 +3796,33 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/framer-motion": {
+      "version": "12.42.2",
+      "resolved": "https://registry.npmjs.org/framer-motion/-/framer-motion-12.42.2.tgz",
+      "integrity": "sha512-5XY9luDiu0oHfHBjpDthFMh0ES+122w6p/papSJBweMkO8Sn+PW2QaEgRblQBpWFnuvZS5qvarpt/hO2pjGmnw==",
+      "license": "MIT",
+      "dependencies": {
+        "motion-dom": "^12.42.2",
+        "motion-utils": "^12.39.0",
+        "tslib": "^2.4.0"
+      },
+      "peerDependencies": {
+        "@emotion/is-prop-valid": "*",
+        "react": "^18.0.0 || ^19.0.0",
+        "react-dom": "^18.0.0 || ^19.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@emotion/is-prop-valid": {
+          "optional": true
+        },
+        "react": {
+          "optional": true
+        },
+        "react-dom": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/function-bind": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.2.tgz",
@@ -5151,6 +5179,47 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/motion": {
+      "version": "12.42.2",
+      "resolved": "https://registry.npmjs.org/motion/-/motion-12.42.2.tgz",
+      "integrity": "sha512-Atvv11yUKIid41cVrRBDVX5m8tF8kNpExRSlbpt6APClhDjtwQssgFHhQzejxw7/7YYbjHSPKBVbHo05BuJT5Q==",
+      "license": "MIT",
+      "dependencies": {
+        "framer-motion": "^12.42.2",
+        "tslib": "^2.4.0"
+      },
+      "peerDependencies": {
+        "@emotion/is-prop-valid": "*",
+        "react": "^18.0.0 || ^19.0.0",
+        "react-dom": "^18.0.0 || ^19.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@emotion/is-prop-valid": {
+          "optional": true
+        },
+        "react": {
+          "optional": true
+        },
+        "react-dom": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/motion-dom": {
+      "version": "12.42.2",
+      "resolved": "https://registry.npmjs.org/motion-dom/-/motion-dom-12.42.2.tgz",
+      "integrity": "sha512-5gIMWLp/PycBtJRJWRgjxke5n8dlvkSn2DrYW+tr3XcqAZY1xZh6BJyooJXCM8wdfM7wfMjkBJNLge1CKPUIRA==",
+      "license": "MIT",
+      "dependencies": {
+        "motion-utils": "^12.39.0"
+      }
+    },
+    "node_modules/motion-utils": {
+      "version": "12.39.0",
+      "resolved": "https://registry.npmjs.org/motion-utils/-/motion-utils-12.39.0.tgz",
+      "integrity": "sha512-8nadJAJjTtqRkmRF36FoJTrywK9nnFmnPwnSMyxaOCU7GDjN9RTMJIxx9De8ErM+vpPhMccr/6fo5WciyQLnMQ==",
+      "license": "MIT"
+    },
     "node_modules/ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",