ychat: make the chat UI mobile-friendly (task is0)

frameset.html used a classic HTML <frameset> (cols=*,150 / rows=*,0) to
split the screen into message stream, userlist, and input areas. Framesets
can't reflow via CSS media queries (cols/rows are fixed HTML attributes,
not CSS) and are deprecated/unreliable in modern mobile browsers, making
this the main mobile blocker. Replaced it with named iframes inside a
flexbox layout (style.css: body.chatlayout and friends) — named iframes
still expose the same window.<name> access the existing JS relies on
(parent.stream.autoscroll()/stopscroll()), so no JS changes were needed.
A media query restacks the userlist below the stream and grows the input
row's height on narrow viewports instead of it eating ~40% of a phone's
width as a fixed side column.

Other mobile fixes:
- Added <meta name="viewport"> to every template (was missing everywhere).
- style.css: capped .text input width (size=60/40 attributes overflowed a
  ~375px screen; CSS width wins over the size attribute so one rule fixes
  every such field), set 16px input font-size to stop iOS Safari's
  auto-zoom-on-focus, gave submit/button inputs larger tap targets, and let
  wide tables (color picker, admin/help content) scroll horizontally
  instead of blowing out the page width.
- input.html: replaced the two position:absolute control rows (fixed pixel
  offsets, no reflow) with wrapping flexbox rows (.input-row/.input-links)
  so the message box and action links stack on narrow screens.

Verified by building the Dockerfile image, running it, registering/logging
in a test user via curl, and confirming the *served* (token-substituted)
HTML for index.html, register.html, frameset.html, and the stream/online/
input frames it references all contain the viewport meta tag and new CSS
classes, with %%tmpid%% correctly substituted in iframe src URLs.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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