fix(web): address web card review — panel body, ol numbering, safe links, docs

- DetailsPanel: render the flattened result content below the web card, so a
  web_fetch's fetched body (and a search's answer/source markdown) stays
  visible on the panel's single-call reading surface — the card is a summary.
- WebBlock: the collapsed source tail keeps each source's original citation
  number via <li value>, and the expand control is a marker-less <li> so the
  <ol> is valid HTML; an empty-hostname URL (file:/data:) falls back to the raw
  URL so a label is never blank.
- web-row / GenericToolCard: both spread WebBlock uniformly with maxSources
  (fetch ignores it, like TerminalBlock's maxLines), dropping the duplicated
  per-kind conditional.
- Docs: WebBlock added to the ui-primitives README (both languages) with a Web
  retrieval section; the ui-conversation README's "inline licensed for this
  intent alone" claim de-absolutized and a web-card paragraph added; the Agent
  Note's safe-link description corrected to the http(s) subset of MarkdownText's
  allowlist (mailto excluded). Fixture source comment aligned with its data.
- Tests: ol numbering + marker-less expander, empty-hostname label fallback,
  the fetched body visible in the panel.

packages/client/ui-conversation/tests/web-card.spec.tsx

@@ -216,11 +216,15 @@ describe('DetailsPanel web Output section', () => {
     expect(view.getByText(/"query"/)).toBeTruthy()
   })
 
-  it('renders the fetch card', () => {
+  it('renders the fetch card and keeps the fetched body below it', () => {
     const view = mount(snapshot({ nodes: [settledFetch()] }), { turnSeq: 11, callId: 'c2', toolName: 'web_fetch' })
     const card = view.container.querySelector('[data-web="fetch"]')
     expect(card?.querySelector('a')?.getAttribute('href')).toBe('https://example.com/page')
     expect(view.getByText('HTTP 200')).toBeTruthy()
+    // The card is a summary (URL + status only); the panel is the single-call
+    // reading surface, so the fetched body still renders below the card.
+    const output = view.getByText('Output').closest('section')
+    expect(output?.querySelector('pre')?.textContent).toContain('fetch body')
   })
 
   it('a non-web result keeps the flattened pre form', () => {