Add a full-page viewer at /documents/:alias that resolves the aliased
node, exports its watermarked bytes, and renders them: PDFs via react-pdf
with page navigation and zoom, images inline, and a download fallback for
other file types. Unauthorized visitors see a locked state.
Wire the documents list "View" action to link into the viewer (fragments
now select alias) and drop the previous open-in-new-tab helpers, since the
viewer owns the export.
Bound MainLayout to the viewport so the top bar and footer stay fixed and
the page area scrolls on its own; the viewer then keeps its toolbar fixed
while the PDF body scrolls, matching the design.
Add the react-pdf dependency with the pdf.js worker bundled via Vite (for
CSP safety) and a headless v2 Separator kit component for the toolbar.
Signed-off-by: Émile Ré <emile@probo.com>
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