Render doc-view pages without mutating PDF buffers

Terminal doc-view rendering used to erase and insert padding/newlines into
the doc-view buffer before placing the page image.  doc-view buffers visit
the original PDF, so changing buffer text marks the document modified and
can corrupt it if saved.

Create the Kitty/Sixel page overlay over the existing buffer contents
instead.  Compute the page image dimensions, prepare/cache the page image,
and schedule a refresh without changing the visited PDF bytes.

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