Fix duplicate warnings and errors in build output

Previously, XCLogParser would output many duplicate warnings/errors when
parsing build logs. This was particularly noticeable with warnings like
deprecated API usage that appeared dozens of times.

Changes:
- Modified BuildLogParser to deduplicate error and warning strings using Set
- Applied deduplication after formatting but before returning results
- Preserves all unique warnings while eliminating exact duplicates

Example: A build with 91 total warnings but only 7 unique ones now
correctly displays just the 7 unique warnings.

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

Co-Authored-By: Claude <[email protected]>

Author: lapfelix

dist/cli.js

@@ -302,7 +302,7 @@ export class BuildLogParser {
         try {
           const result: XCLogParserResult = JSON.parse(stdout);
 
-          const errors = (result.errors || []).map(error => {
+          const errors = [...new Set((result.errors || []).map(error => {
             const fileName = error.documentURL ? error.documentURL.replace('file://', '') : 'Unknown file';
             const line = error.startingLineNumber;
             const column = error.startingColumnNumber;
@@ -316,9 +316,9 @@ export class BuildLogParser {
             }
 
             return `${location}: ${error.title}`;
-          });
+          }))];
 
-          const warnings = (result.warnings || []).map(warning => {
+          const warnings = [...new Set((result.warnings || []).map(warning => {
             const fileName = warning.documentURL ? warning.documentURL.replace('file://', '') : 'Unknown file';
             const line = warning.startingLineNumber;
             const column = warning.startingColumnNumber;
@@ -332,7 +332,7 @@ export class BuildLogParser {
             }
 
             return `${location}: ${warning.title}`;
-          });
+          }))];
 
           const buildResult: ParsedBuildResults = {
             errors,