* feat(web): add View Source toggle to resource preview (closes#1552)
Markdown, CSV, and HTML resources render in a way that hides the
underlying text (react-markdown, the CSV table, the sandboxed HTML
iframe). Add a "View Source" button to the resource preview footer, left
of Refresh and styled to match it, that swaps the rendered preview for
the raw resource text. In source mode the button reads "View Rendered".
- Only shown for markdown/csv/html (other kinds already show their text,
or have no meaningful text source).
- Source mode forces ContentViewer through its plain-text renderer; the
displayed MIME label keeps the resource's real type.
- The toggle resets to the rendered view when the previewed resource
changes (React's adjust-state-during-render pattern — no effect).
Tests cover the toggle round-trip, per-kind visibility, and the reset;
a Storybook play function exercises rendered → source → rendered.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* refactor(web): address View Source review nits (#1553)
- Per-item source gating: in source mode only source-toggleable items
switch to plain text, so a mixed multi-part resource doesn't force an
image/PDF blob through the text decoder.
- Share a FooterButton constant between Refresh and the View Source
toggle so the two stay visually identical (per the subcomponent
guidance — both had the same two inline props).
- Add aria-pressed to the toggle so assistive tech gets explicit on/off
state beyond the label flip.
Tests added for the aria-pressed state and the mixed multi-part case.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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