feat: rebuild desktop UI to match Figma + website, hero slider improvements

- Desktop sidebar (262px, blue gradient, white pill nav), topbar (search + bell + avatar), responsive shell rewritten
- Desktop homepage: immersive hero with Ken Burns animation, pill category chips, date badge cards matching mvnew.eventifyplus.com/home
- Desktop calendar: 60/40 two-column layout with white background
- Desktop profile: full-width banner + 3-column event grids
- Desktop learn more: hero image + about/venue columns + gallery strip
- Desktop settings/contribute: polished to match design system
- Mobile hero slider: RepaintBoundary, animated dots with 44px tap targets, 5s auto-scroll, 8s post-swipe delay, shimmer loading, dynamic event type badge, human-readable dates
- Guest access: requiresAuth false on read endpoints
- Location fix: show place names instead of lat/lng coordinates
- Version 1.6.1+17

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

android/app/build.gradle.kts

@@ -22,8 +22,8 @@ android {
         applicationId = "com.sicherhaven.eventify"
         minSdk = flutter.minSdkVersion
         targetSdk = flutter.targetSdkVersion
-        versionCode = 15
-        versionName = "1.5(p)"
+        versionCode = 17
+        versionName = "1.6.1(p)"
     }
 
     // ---------- SIGNING CONFIG ----------
@@ -51,9 +51,9 @@ android {
             // Use the release signing config created above
             signingConfig = signingConfigs.getByName("release")
 
-            isMinifyEnabled = false
-            isShrinkResources = false
-            // proguardFiles(getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro")
+            isMinifyEnabled = true
+            isShrinkResources = true
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
         }
     }
 }

android/app/proguard-rules.pro

@@ -0,0 +1,28 @@
+# Flutter
+-keep class io.flutter.app.** { *; }
+-keep class io.flutter.plugin.** { *; }
+-keep class io.flutter.util.** { *; }
+-keep class io.flutter.view.** { *; }
+-keep class io.flutter.** { *; }
+-keep class io.flutter.plugins.** { *; }
+
+# Google Maps
+-keep class com.google.android.gms.maps.** { *; }
+-keep interface com.google.android.gms.maps.** { *; }
+
+# Keep annotations
+-keepattributes *Annotation*
+-keepattributes SourceFile,LineNumberTable
+
+# Play Core (deferred components)
+-dontwarn com.google.android.play.core.splitcompat.SplitCompatApplication
+-dontwarn com.google.android.play.core.splitinstall.SplitInstallException
+-dontwarn com.google.android.play.core.splitinstall.SplitInstallManager
+-dontwarn com.google.android.play.core.splitinstall.SplitInstallManagerFactory
+-dontwarn com.google.android.play.core.splitinstall.SplitInstallRequest$Builder
+-dontwarn com.google.android.play.core.splitinstall.SplitInstallRequest
+-dontwarn com.google.android.play.core.splitinstall.SplitInstallSessionState
+-dontwarn com.google.android.play.core.splitinstall.SplitInstallStateUpdatedListener
+-dontwarn com.google.android.play.core.tasks.OnFailureListener
+-dontwarn com.google.android.play.core.tasks.OnSuccessListener
+-dontwarn com.google.android.play.core.tasks.Task