Fix: Resolve Comment Draft Collisions by Using Full File Path (#370)

* fix(FilesView): use file path for drafts labeling

Use file path for draft labels instead of file name for precise grouping
Filter and associate drafts by file path to ensure correct per-file draft retrieval
Improve handling of files with identical names across directories

* fix(PierreDiffViewer): use fileName as label for drafts

Use fileName as the draft label when editing or adding diffs
Fallback to 'unknown' if fileName is missing for draft labels
Align draft filtering to the provided fileName rather than basename

* refactor(ui): remove unused fileLabel computation

packages/ui/src/components/views/FilesView.tsx

@@ -750,7 +750,7 @@ export const FilesView: React.FC = () => {
       addDraft({
         sessionKey,
         source: 'file',
-        fileLabel: selectedFile.name,
+        fileLabel: selectedFile.path,
         startLine: finalRange.start,
         endLine: finalRange.end,
         code,
@@ -1765,7 +1765,7 @@ export const FilesView: React.FC = () => {
     const sessionDrafts = allDrafts[sessionKey] ?? [];
     // Filter drafts for current file
     const fileDrafts = sessionDrafts.filter(
-      (d) => d.source === 'file' && d.fileLabel === selectedFile.name
+      (d) => d.source === 'file' && d.fileLabel === selectedFile.path
     );
 
     const widgets: BlockWidgetDef[] = [];