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* feat(app): add fullscreen viewer for Mermaid diagrams on web Add a fullscreen action to the diagram toolbar that opens the diagram in a modal ZoomableViewport with free zoom/pan, closable via the close button, Escape, or clicking outside the diagram. The sandboxed iframe runtime moves into a shared MermaidIframeRuntime so the inline host and the fullscreen viewer drive the same renderer. Fixes uncovered while verifying the feature end to end: - The runtime measured the rendered SVG with getBoundingClientRect(), which depends on the iframe size the host derives from that very measurement. Each streaming re-render shrank the reported size by the diagram box padding, ratcheting diagrams down to a few pixels. Measure the viewBox instead, which is the diagram's own size, and let the SVG fill whatever frame the host provides. - ZoomableViewport's root is flex: 1, so as a flex item its 0% basis overrode the inline diagram box height and the box collapsed, scaling the diagram tiny and clipping the toolbar unclickable. Size the box from its height and keep a minimum tall enough for the toolbar. - react-native-web's Modal focus trap focuses the first descendant that takes focus, which was the diagram iframe; every keystroke then landed in the sandboxed frame and Escape never reached the window listener. Mark the presentational iframe inert and focus the viewer's content layer on mount. Closes #4106 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * test(app): exercise Mermaid fullscreen interactions Cover zoom, pan, outside-click dismissal, and streaming layout through the real browser path. Remove the mocked DOM test that duplicated those behaviors without exercising the viewport or iframe runtime. --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com> Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>