Fix caption words or colour

Fix caption words or the key-word colour of a finished video, without a new edit; timing never moves. Either rewrite lines (from, to, text from get_project_context captions) or swap words everywhere with replace: [{ heard, spelled }] (brand names, people). A swapped name is also remembered for later videos. Each spoken word keeps a caption word, so a 2-word name cannot become 1 word here: use remember plus revise_video. Free; 5 a day per video. Cost: Free: no credits and no change round. Same as the MCP tool fix_captions.