fix(ios): preserve code block styles inside list items (#174)

* fix(ios): preserve code block styles inside list items

When a fenced code block appears inside a list item, ListItemRenderer's
paragraph style enumeration was overwriting the code block's own styles
(padding, LTR indent) with list item styles. This caused code block
content to display list markers (e.g. "2.") on every line.

Skip ranges that have the CodeBlockAttributeName attribute, since
CodeBlockRenderer has already applied the correct paragraph style.

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

* fix(ios): also guard code blocks in checked task list decorations

Add the same CodeBlockAttributeName check to applyCheckedDecorationsTo
so that checked task list strikethrough/color styles don't bleed into
code block ranges inside list items.

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

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: Mile-Away

ios/renderer/ListItemRenderer.m

@@ -1,5 +1,6 @@
 #import "ListItemRenderer.h"
 #import "ENRMUIKit.h"
+#import "LastElementUtils.h"
 #import "MarkdownASTNode.h"
 #import "ParagraphStyleUtils.h"
 #import "RenderContext.h"
@@ -95,7 +96,7 @@ - (void)renderNode:(MarkdownASTNode *)node into:(NSMutableAttributedString *)out
   }
 
   // We enumerate to ensure we don't overwrite styles of nested sub-lists
-  // that may have already been rendered inside this item.
+  // or code blocks that may have already been rendered inside this item.
   [output enumerateAttribute:ListDepthAttribute
                      inRange:itemRange
                      options:0
@@ -106,6 +107,16 @@ - (void)renderNode:(MarkdownASTNode *)node into:(NSMutableAttributedString *)out
                       return;
                     }
 
+                    // Skip code block ranges — CodeBlockRenderer already applied its own
+                    // paragraph style (padding, LTR indent). Overwriting would add list
+                    // markers ("2.") inside the code block.
+                    NSNumber *isCodeBlock = [output attribute:CodeBlockAttributeName
+                                                     atIndex:range.location
+                                              effectiveRange:nil];
+                    if ([isCodeBlock boolValue]) {
+                      return;
+                    }
+
                     NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
                     style.baseWritingDirection = currentWritingDirection();
                     style.firstLineHeadIndent = totalIndent;
@@ -158,10 +169,19 @@ - (void)applyCheckedDecorationsTo:(NSMutableAttributedString *)output
                      options:0
                   usingBlock:^(NSNumber *depth, NSRange segmentRange, BOOL *stop) {
                     BOOL isNestedSubItem = (depth && [depth integerValue] > nestingLevel);
+                    if (isNestedSubItem) {
+                      return;
+                    }
 
-                    if (!isNestedSubItem) {
-                      [output addAttributes:checkedAttrs range:segmentRange];
+                    // Skip code block ranges — preserve CodeBlockRenderer styles.
+                    NSNumber *isCodeBlock = [output attribute:CodeBlockAttributeName
+                                                     atIndex:segmentRange.location
+                                              effectiveRange:nil];
+                    if ([isCodeBlock boolValue]) {
+                      return;
                     }
+
+                    [output addAttributes:checkedAttrs range:segmentRange];
                   }];
 }