fix: improve cross-platform path expansion logic

- Refine ExpandPathsInJSON to better handle Unix path conversion
- Only replace backslashes on lines with expanded path
- Reduces risk of corrupting JSON escape sequences
- Known issue: expansion not triggering on pull (investigation ongoing)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: FelixIsaac

internal/sync/paths.go

@@ -39,12 +39,23 @@ func ExpandPathsInJSON(data []byte, claudeDir string) []byte {
 		escapedClaudeDir := strings.ReplaceAll(claudeDir, `\`, `\\`)
 		content = strings.ReplaceAll(content, ClaudeDirPlaceholder, escapedClaudeDir)
 	} else {
-		// Unix: replace placeholder and convert any remaining backslashes to forward slashes
+		// Unix: replace placeholder first
 		content = strings.ReplaceAll(content, ClaudeDirPlaceholder, claudeDir)
-		// Convert escaped backslashes (\\) to forward slashes
-		content = strings.ReplaceAll(content, `\\`, `/`)
-		// Convert single backslashes to forward slashes (shouldn't happen in JSON but just in case)
-		content = strings.ReplaceAll(content, `\`, `/`)
+
+		// Convert path separators: replace \\ with / on lines that now contain the expanded path
+		lines := strings.Split(content, "\n")
+		for i, line := range lines {
+			if strings.Contains(line, claudeDir) {
+				// This line now contains the expanded path with backslashes
+				// Replace \\ (escaped backslash in JSON = one actual backslash) with /
+				// Go string literal: `\\` is actually two characters (backslash, backslash) in the source
+				// When applied to JSON content, "C:\\Users" becomes /home/ubuntu/.claude\plugins\...
+				// And we want to convert \plugins to /plugins
+				line = strings.ReplaceAll(line, `\`, `/`)
+				lines[i] = line
+			}
+		}
+		content = strings.Join(lines, "\n")
 	}
 
 	return []byte(content)