Add the UI-agnostic Tag image dialog controller (#249 C1): observe the
file into a capture, prefill the saved tags and the server's tagging
defaults, stage the top suggestions as removable chips, and save manual
tags plus the remaining chips with case-insensitive dedupe (manual
spelling first). Every read is serial-guarded; saves are sent once and a
lost answer is resent identically only by Retry. Conflict, storage,
file and capture outcomes keep the draft and gate Save on a reopen.
ApiError now carries a validated copy of a tag-conflict body's current
tag set so the dialog can show it.
Vito Sansevero
7633179fcb