Whole-word text replacement and more reliable speaker and task edits

Text replacement can match whole words only, speaker renames carry through meeting notes, and a few false warnings and needless retries are gone.

Text replacement can now match whole words only, so it no longer changes parts of longer words. Renaming a speaker now carries through your meeting notes, and a few fixes remove false warnings and needless retries.

• Text replacement has a new wholeWord option that prevents partial word matches when updating documents, and the text replacement guide now covers it.
• Renaming a speaker now updates meeting summaries, minutes and action items automatically. Task assignees are easy to edit, and your edits are kept even when background analysis runs.
• Image model pricing no longer shows false warnings for models with tiered pricing, such as DALL-E 3.
• Requests with an invalid file path now return a standard 400 error instead of a retryable 500, so clients stop retrying requests that can never succeed.