[banteg]

Fixes from a review of the Astro build. I verified each finding in the code and the browser first.

• Reader keys: in Pages mode, pressing Space on a focused button (Play, Next, Zoom…) turned the page and blocked the button. Now Space presses a focused button, link or text toggle. Arrow keys still turn pages wherever focus is, and Space still turns pages when nothing is focused.
• Info menu: on short screens (844×390) the menu ran past the bottom and its links couldn't be reached. It's now capped at the space below the header and scrolls.
• Zoom while loading: the viewer loads on demand, and a click before it finished loading did nothing. Clicks now wait for it. If the viewer can't load, for example after a deploy replaced its files, the click opens the image itself.
• Background video: it kept playing behind the comic reader's opaque page. It now pauses on comic pages and resumes elsewhere. It also stays paused for visitors who ask for reduced motion, who were already shown the still poster instead.
• Preload: phones no longer preload the 211 KB comic art, which sits below their first screen. Screens 48rem and wider still preload it.
• Image sizes: homepage images now get their real sizes, read from the files at build time with sharp, as the tribute pages already do. The Temple art had claimed to be 600×895 but is 1000×1365.

Tested in the browser:

• Space on Play plays music without turning the page; Space and the arrow keys still turn pages.
• The menu fits and scrolls at 844×390.
• Zoom opens and closes.
• The video pauses in the reader and resumes after going back.
• No console errors.

I couldn't reproduce the zoom race, so that fix is verified by reading the code. Lint, astro check and the build pass.

[github-actions]

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