refactor: rename BlockLabel type to label for consistency across models

Author: Sembauke

mobile-app/lib/models/learn/curriculum_model.dart

@@ -154,7 +154,7 @@ class Block {
   final String dashedName;
   final SuperBlock superBlock;
   final BlockLayout layout;
-  final BlockLabel type;
+  final BlockLabel label;
   final List description;
   // Blocks in chapter-based super blocks don't have `order`.
   final int? order;
@@ -165,7 +165,7 @@ class Block {
   Block({
     required this.superBlock,
     required this.layout,
-    required this.type,
+    required this.label,
     required this.name,
     required this.dashedName,
     required this.description,
@@ -216,7 +216,7 @@ class Block {
       ),
       layout: handleLayout(data['blockLayout']),
       // Support both blockLabel and blockType for backward compatibility
-      type: (data['blockLabel'] ?? data['blockType']) != null
+      label: (data['blockLabel'] ?? data['blockType']) != null
           ? blockLabelFromString(data['blockLabel'] ?? data['blockType'])
           : BlockLabel.legacy,
       name: data['name'],

mobile-app/lib/models/learn/daily_challenge_model.dart

@@ -115,7 +115,7 @@ class DailyChallengeBlock {
         name: 'Daily Challenges',
       ),
       layout: BlockLayout.challengeGrid,
-      type: BlockLabel.legacy,
+      label: BlockLabel.legacy,
       description: [description],
       challenges: challenges
           .map((overview) => ChallengeOrder(

mobile-app/lib/ui/views/learn/block/block_template_view.dart

@@ -29,7 +29,7 @@ class BlockTemplateView extends StatelessWidget {
         model,
         child,
       ) {
-        final (icon, color) = model.getIconData(block.type);
+        final (icon, color) = model.getIconData(block.label);
 
         return Padding(
           padding: const EdgeInsets.only(bottom: 16.0),

mobile-app/test/unit/challenge_utils_test.dart

@@ -29,7 +29,7 @@ void main() {
     return Block(
       superBlock: SuperBlock(dashedName: 'superblock', name: 'Super Block'),
       layout: BlockLayout.challengeList,
-      type: BlockLabel.lecture,
+      label: BlockLabel.lecture,
       name: 'Block 1',
       dashedName: 'block-1',
       description: [],