Description As an Author, I want to add a caption to an image so I can give Readers more context.

Acceptance Criteria

Testing

Recap

Implemented the image-caption restriction so captions remain inline rich text only and no longer expose block-insertion UI or slash commands.

Files touched

frontend/packages/editor/src/inline-add-block-button.tsx
frontend/packages/editor/src/blocknote/core/extensions/SlashMenu/SlashMenuPlugin.ts
frontend/packages/editor/src/blocknote/core/shared/plugins/suggestion/SuggestionPlugin.ts
frontend/packages/editor/src/inline-add-block-button.test.tsx
frontend/packages/editor/src/blocknote/core/__tests__/slash-menu-caption-guards.test.ts

Main objects changed

InlineAddBlockButton
- Added a guard so the floating Insert Block button does not render when selection is inside an image caption.
isSlashMenuEnabled
- Added as a shared helper in SlashMenuPlugin.ts to centralize whether slash commands are allowed in the current selection context.
SlashMenuProsemirrorPlugin
- Wired the new guard into slash-menu activation so / does not open the menu inside image captions.
setupSuggestionsMenu
- Extended with an optional isEnabled context guard.
- Prevents activation in blocked contexts and closes the menu if selection moves into one.

Behavior delivered

Tests added

inline-add-block-button.test.tsx
- Verifies the button appears in a normal empty paragraph.
- Verifies the button is hidden inside an image caption.
slash-menu-caption-guards.test.ts
- Verifies slash menu works in normal paragraphs.
- Verifies slash menu is blocked inside image captions.
- Verifies an active slash menu closes when selection moves into a caption.

Notes

No schema/content-model change was made.
Existing plain-text caption behavior was preserved.
Full local validation was blocked in this environment because frontend dependencies were not installed.