Plan step 17, on N-06, N-07 and C-07. The shell now changes at 600, 840 and
1200 and nowhere else: a compact window keeps the navigation bar and the modal
rail; `medium` (600-839) gets the collapsed rail in the layout and no bar;
`expanded` (840-1199) gets a standard rail, collapsed, whose menu button
expands it in place rather than over a scrim; `large` and above start it
expanded, which is what M3 prefers once there is room.
`data-rail` alone could not say "collapsed at expanded, expanded at large",
since it carries `rail.default` for a visitor who never chose. <x-theme-script>
now also writes `data-rail-auto` while nothing is stored, the `rail-collapsed:`
variant reads it in the 840-1199 band, and `$store.rail.auto` mirrors it for
Alpine; the first press of the menu button drops it, so a remembered choice
still wins in both bands. `rail.default` and the rest of `$store.rail` are
unchanged, and the attribute rides through `wire:navigate` with the others.
`--material-margin` carries M3's window margin on the shell -- 16px compact,
24px from `medium` -- and the content region is padded with it, so the showcase
pages drop their own gutters.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
Plan step 16. `navigation.js` takes its standard-rail threshold from
`from('expanded')` (840px) instead of the 64rem it had, and `navigation.css`'s
three 64rem queries follow, so the whole expanded class gets the in-layout
collapsible rail M3 asks for rather than one that opens over a scrim (N-06);
its two 40rem queries become 37.5rem, the compact/medium boundary the bar's own
container query already used (N-07). `search.js` and `datepicker.js` swap their
39.99rem media strings for `upTo('medium')`, so the full-screen search view and
the modal date picker end at 600px, not 640px.
The time picker's landscape layout stops keying on width at all: M3 swaps it on
orientation and viewport height, so it is now landscape plus a window too short
for the upright dial (35rem, the dialog's own height), and the two dial-shrink
rules key on height alone.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
M3 Expressive's flexible navigation bar, the collapsed, expanded and
modal navigation rail with its state applied before the first paint,
and an adaptive app shell composing them. The head script now restores
the theme and rail attributes that wire:navigate strips from <html>.
Completes Phase 8.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy
