**AGENT: ** Here are two subtle but important issues with this implementation:

1. Silent deletion of explicitly requested non-ignorable spaces (&ngsp; and  )

The PR description notes: "WhitespaceVisitor has already converted &ngsp; (and  ) into a plain space character, making them indistinguishable from insignificant whitespace via .trim().length". This contains a factual error and introduces a logical inconsistency:

• WhitespaceVisitor actually only converts &ngsp; to a plain space. It leaves   as \u00A0 (non-breaking space).
• The only reason   gets caught is because JavaScript's String.prototype.trim() intrinsically strips \u00A0.
• Because findConnectedBlocks relies purely on .trim().length === 0, if a user explicitly writes @if (c) {} &ngsp; @else {} or @if (c) {}   @else {}, those text nodes are pushed to pendingTextNodes and then silently deleted when the @else block is found.
• Inconsistency: If a user types explicit text like A between @if and @else, it correctly breaks the block connection and throws a compilation error (@else block can only be used after an @if...). Explicit spaces like &ngsp; and   should arguably trigger the exact same parsing error (or be strictly preserved), rather than being mysteriously swallowed.

2. AST Reordering and i18n misattachment for skipped sibling nodes

The PR (and the existing logic it builds upon) uses continue to skip over html.Comment nodes, and now also defers whitespace nodes via pendingTextNodes. When an @else block is found, findConnectedBlocks commits the pending text to processedNodes but completely ignores the skipped comments.

• Because the outer @if block eagerly consumes the @else block into its single t.IfBlock AST representation, the main visitChildren loop processes the IfBlock first.
• It then proceeds to process the comments that were physically located between the @if and @else blocks because they were never added to processedNodes.
• As a result, any comment placed between the branches is structurally reordered to appear after the entire IfBlock in the AST.
• Impact: If a user writes an <!-- i18n: meaning | description --> comment specifically to document the @else block, that comment will be completely disjointed from the @else branch and will incorrectly attach itself to whatever element comes after the entire conditional block.