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fix(compiler): preserve coverage pragmas in JSX (#3301)

* fix(compiler): preserve coverage pragmas in JSX

* fix(compiler): implement SSR source access

* fix(compiler): align coverage pragma carry-through between Babel and Oxc

Both compilers now agree on which authored pragmas lead a component's
`children` getter:

- Block comments only: line comments are never carried (Oxc dropped
  `{// c8 ignore next}` and misread `// c8 ignore` inside a block comment).
- Pragmas from consecutive empty containers are all carried, in order
  (Oxc kept only the last container).
- A pragma followed by text still leads the getter (Babel dropped it when
  the next child was text or a same-line space).
- Only pragmas print, not neighboring notes in the same container.

Oxc re-anchors each run's pragma comments to the first pragma's start and
spans the getter there. The shared fixture covers every case with
expectations both test suites assert across dom/ssr/universal.

Co-authored-by: Claude via Cursor <noreply@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Co-authored-by: Ryan Carniato <ryansolid@gmail.com>
Co-authored-by: Claude via Cursor <noreply@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

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