Add Android theme system and fix package naming issues

This commit adds a comprehensive theming system to Android matching iOS, and fixes package declarations throughout the codebase to match directory structure.

Theme System Additions:
- Added 11 themes matching iOS: Default, Teal, Ocean, Forest, Sunset, Monochrome, Lavender, Crimson, Midnight, Desert, Mint
- Created ThemeColors.kt with exact iOS color values for light/dark modes
- Added ThemeManager.kt for dynamic theme switching
- Created Spacing.kt with standardized spacing constants (xs/sm/md/lg/xl)
- Added ThemePickerDialog.kt for theme selection UI
- Integrated theme switching in ProfileScreen.kt
- Updated App.kt to observe ThemeManager for reactive theming

Component Library:
- Added StandardCard.kt and CompactCard.kt for consistent card styling
- Added FormTextField.kt with error/helper text support
- Added FormSection.kt for grouping related form fields
- Added StandardEmptyState.kt for empty state UI

Package Migration:
- Fixed all package declarations to match directory structure (com.example.mycrib.*)
- Updated package declarations in commonMain, androidMain, and iosMain
- Fixed all import statements across entire codebase
- Ensures compilation on both Android and iOS platforms

iOS Theme Rename:
- Renamed "Default" theme to "Teal" in iOS
- Renamed "Bright" theme to "Default" in iOS to make vibrant colors the default

Build Status:
- ✅ Android builds successfully
- ✅ iOS builds successfully

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

composeApp/src/iosMain/kotlin/com/example/mycrib/MainViewController.kt

@@ -1,10 +1,10 @@
 package com.example.mycrib
 
 import androidx.compose.ui.window.ComposeUIViewController
-import com.mycrib.storage.TokenManager
-import com.mycrib.storage.TokenStorage
-import com.mycrib.storage.TaskCacheManager
-import com.mycrib.storage.TaskCacheStorage
+import com.example.mycrib.storage.TokenManager
+import com.example.mycrib.storage.TokenStorage
+import com.example.mycrib.storage.TaskCacheManager
+import com.example.mycrib.storage.TaskCacheStorage
 
 fun MainViewController() = ComposeUIViewController {
     // Initialize TokenStorage with iOS TokenManager

composeApp/src/iosMain/kotlin/com/example/mycrib/network/ApiClient.ios.kt

@@ -1,4 +1,4 @@
-package com.mycrib.shared.network
+package com.example.mycrib.network
 
 import io.ktor.client.*
 import io.ktor.client.engine.darwin.*

composeApp/src/iosMain/kotlin/com/example/mycrib/platform/ImagePicker.ios.kt

@@ -1,4 +1,4 @@
-package com.mycrib.platform
+package com.example.mycrib.platform
 
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember

composeApp/src/iosMain/kotlin/com/example/mycrib/storage/TaskCacheManager.ios.kt

@@ -1,4 +1,4 @@
-package com.mycrib.storage
+package com.example.mycrib.storage
 
 import platform.Foundation.NSUserDefaults
 import kotlin.concurrent.Volatile

composeApp/src/iosMain/kotlin/com/example/mycrib/storage/TaskCacheStorage.ios.kt

@@ -1,4 +1,4 @@
-package com.mycrib.storage
+package com.example.mycrib.storage
 
 internal actual fun getPlatformTaskCacheManager(): TaskCacheManager? {
     return TaskCacheManager.getInstance()

composeApp/src/iosMain/kotlin/com/example/mycrib/storage/TokenManager.ios.kt

@@ -1,4 +1,4 @@
-package com.mycrib.storage
+package com.example.mycrib.storage
 
 import platform.Foundation.NSUserDefaults
 import kotlin.concurrent.Volatile

composeApp/src/iosMain/kotlin/com/example/mycrib/storage/TokenStorage.ios.kt

@@ -1,4 +1,4 @@
-package com.mycrib.storage
+package com.example.mycrib.storage
 
 internal actual fun getPlatformTokenManager(): TokenManager? {
     return TokenManager.getInstance()

composeApp/src/iosMain/kotlin/com/example/mycrib/util/ImageCompressor.ios.kt

@@ -1,6 +1,6 @@
-package com.mycrib.util
+package com.example.mycrib.util
 
-import com.mycrib.platform.ImageData
+import com.example.mycrib.platform.ImageData
 import kotlinx.cinterop.*
 import platform.Foundation.*
 import platform.UIKit.*