- index.html, kernel.html: were missing the viewport meta entirely;
mobile fell back to the default 980px layout and the content was
scaled down. Add the standard 'width=device-width,initial-scale=1'
and centre the body with margin:0 auto so the 640px max-width is
centered instead of left-aligned on wide displays.
- host-your-own.html, how-it-works.html, zebra-audio.html, chat.html:
add a 600px breakpoint that tightens body padding to 1rem, shrinks
the h1 from 3rem to 2.2rem, and lets long URLs / pubkey hashes wrap
via overflow-wrap:anywhere on body prose. .code / .diagram already
use overflow-x:auto so internal scrolling stays bounded to the box,
never pushes the page wider than the viewport.
- chat.html: cap the QR share box's canvas (was a fixed 320px square)
with max-width:100% on phones, so 320px-wide handsets don't overflow.
- zebra-audio.html: the mute button had a fixed 6rem width to keep the
'mute'/'unmute' label from shifting the row; on narrow phones that
width forced wrapping. Drop it back to auto on small viewports.
All pages stamp+verify; the integrity footer hashes in the source
match the served files after `make stamp`.
