feat(website): drop the tmux bar from the hero demo

The demo is the client, not the terminal it happens to run in. Removing the
bar takes the tmux window list, session name, host and clock with it, plus
the three --tmux-* tokens that existed only to paint it.

The scale floor goes too: the terminal now shrinks to whatever width it is
given instead of stopping at half size and scrolling sideways, which makes
useFitScale's minScale parameter and the media query feeding it dead weight.

website/src/components/tui/hero-terminal.tsx

@@ -1,6 +1,6 @@
 import { useCallback, useEffect, useMemo, useRef, useState, type KeyboardEvent } from 'react'
 
-import { MacWindow, ShortcutBar, StatusLine, TmuxBar, type StatusCounts } from './chrome'
+import { MacWindow, ShortcutBar, StatusLine, type StatusCounts } from './chrome'
 import {
   RESULTS,
   SEARCHES,
@@ -362,22 +362,9 @@ export const HeroTerminal = () => {
     setPhase('interactive')
   }
 
-  // Below 820px, stop shrinking at half size and let the wrapper scroll.
-  const [minScale, setMinScale] = useState(() =>
-    matches('(max-width: 820px)') ? 0.5 : 0,
-  )
-  useEffect(() => {
-    const query = window.matchMedia('(max-width: 820px)')
-    const sync = (event: MediaQueryListEvent) => {
-      setMinScale(event.matches ? 0.5 : 0)
-    }
-    query.addEventListener('change', sync)
-    return () => {
-      query.removeEventListener('change', sync)
-    }
-  }, [])
-
-  const { wrapRef, innerRef, scale, height, ready } = useFitScale(DESIGN_WIDTH, minScale)
+  // No floor: the terminal shrinks to whatever width it is given rather than
+  // holding a minimum size and scrolling sideways.
+  const { wrapRef, innerRef, scale, height, ready } = useFitScale(DESIGN_WIDTH)
 
   const shownSearches = searches.map((search, i) =>
     i === 0 && phase === 'searching' ? { ...search, status: '⋯', results: '—' } : search,
@@ -401,7 +388,6 @@ export const HeroTerminal = () => {
           }}
         >
           <MacWindow>
-            <TmuxBar />
             {/*
               role="application" is the ARIA escape hatch for a widget that
               handles its own keys: it stops screen readers intercepting