Bound a text field's width from medium

M3 § Text Fields, Behaviour: compact may let a field span full width, but
medium and expanded must bound it — "never let it span the full width of a
large screen". Nothing in the package capped a field (plan step 24, audit
docs/audits/m3-alignment/inputs.md § Missing). From `medium` a field now stops
at 40rem — the site names no number, so the header says where this one comes
from — which a `max-w-*` class beats and `full` takes off. The search bar
already carries M3's own 720px.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

resources/boost/skills/livewire-material-development/SKILL.md

@@ -555,6 +555,7 @@ M3 text fields. `variant`: `outlined` or `filled`; without it, `config('livewire
 - `<x-input>`: `icon`, `icon-right`, `prefix`, `suffix`, `clearable`, `copyable` (copies the value, confirms with a snackbar), `counter`, `size` (`sm` 40px, `xs` 32px — for unlabelled toolbar controls; give them `aria-label`), `mono`.
 - `<x-password>`: a reveal button; `icon`, `size`.
 - `<x-textarea>`: grows from `rows` (3) to `max-rows`, then scrolls; `:autogrow="false"` for a fixed, hand-resizable one; `counter`.
+- Width: M3 asks that a text field never span the full width of a large screen, so from `medium` (600px) every field stops at **40rem**; below that it fills its pane. A `max-w-*` class on the component narrows or widens it, and `full` (on `<x-field>`, `<x-input>`, `<x-textarea>`) takes the bound off for a field that really is the width of its pane — a search row, an editor. `<x-search>`'s bar carries M3's own bound, 720px.
 - `counter` (on `<x-input>` and `<x-textarea>`) puts M3's character counter at the end of the supporting-text row, beside the hint or the error: `n/max`, counted on every keystroke against the field's own `maxlength`, and in the error colour once the value is past it. It needs `maxlength` — without one there is nothing to count against and nothing is drawn. It is said as "Character count, 5/20" from a polite region a second after typing stops.
 - `<x-select>`: native `<select>` (M3 menu where the browser supports customizable selects). `options` as `['id' => …, 'name' => …, 'disabled' => bool]`, `option-value`, `option-label`, `placeholder` + `placeholder-value`, or `<option>`s in the slot; `icon`, `size`.
 - `<x-file>`: native file input; errors from `photos` and `photos.*`. Show previews of what was chosen yourself.