chore(sdui): re-record plugin-grid's sources digest

node scripts/gen-sdui-manifest-node.mjs on the fixed tree; the artefact
did not move (manifestSha256 unchanged), only plugin-grid's sources
digest. node scripts/check-sdui-manifest.mjs exit 0.

Claude-Session: https://claude.ai/code/session_01SMps7wq7rBTk53e8KTSEup
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

scripts/sdui-manifest.sources/plugin-grid.json

@@ -1 +1 @@
-{"package":"ui/packages/plugin-grid","sources":38,"sha256":"f6f7b1cbd89a1536a6e33febf4db131b8d526bd7281be460c401dccb8e97876a","manifestSha256":"1f6e1ccb925a678eaa393f9091dfc7d0285e4e3626e0a5c61a5474687debabb7"}
+{"package":"ui/packages/plugin-grid","sources":38,"sha256":"19011afad35291ac1b00e3930ae1e4c02cf6ec968990f481b798c8b5ed80ea7a","manifestSha256":"1f6e1ccb925a678eaa393f9091dfc7d0285e4e3626e0a5c61a5474687debabb7"}