Revamp branding, UI styling, and HAFAS integration

- Update BRAND_GUIDELINES.md with new melting clock logo concept
- Rebrand UI components with new violet-to-pink gradient color scheme
- Implement HAFAS authentication headers and GET support in route
- Update logo SVGs to match new brand guidelines
- Fix HAFAS time format to exclude millisecond padding
- Update default station to Mödling Bahnhof
- Bump workspace package versions to 1.0.0

package.json

@@ -1,6 +1,6 @@
 {
   "name": "time-to-leave",
-  "version": "1.0.0"
+  "version": "1.0.0",
   "private": true,
   "workspaces": [
     "apps/*",