fix(git-sync): resolve PDF path from repo root, not from subPath

pdfPath is now joined against tmpDir (repo root) instead of fileRoot
(subPath dir), so the PDF can be placed anywhere in the repo
independently of where the project files land.

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

services/web/app/src/Features/GitSync/GitSyncHandler.mjs

@@ -137,7 +137,7 @@ async function pushToRemote(
         pdfBuildId,
         'output.pdf'
       )
-      const pdfDest = join(fileRoot, pdfPath)
+      const pdfDest = join(tmpDir, pdfPath)
       await mkdir(dirname(pdfDest), { recursive: true })
       await pipeline(pdfStream, createWriteStream(pdfDest))
       logger.debug({ projectId }, 'git sync: PDF included')