fix(web): show missing-file state in browse#1381

DivyamTalwar wants to merge 8 commits into

sourcebot-dev:mainsourcebot-dev/sourcebot:mainfrom

DivyamTalwar:divyamtalwar/fix-827-browse-file-not-foundDivyamTalwar/sourcebot:divyamtalwar/fix-827-browse-file-not-foundCopy head branch name to clipboard