Editor & UI bug fixes

Fixed

• Description showing unsaved changes on open: Opening a task could sometimes show the Save/Cancel buttons on the description even though nothing had been edited.
• Comment with only a list couldn’t be submitted: A comment consisting entirely of a bullet or numbered list kept the “Add comment” button disabled despite having real content.
• Link existing task search overflowing its container: The search dialog was rendering outside its own borders when task titles were long.