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Closes #1738. Four concrete fixes surfaced by the savings-goals audit + #1737 universal checklist: 1. Focus ring (WCAG 2.4.7). `base.css` had `focus-visible:outline-gray-900` which is **1.07:1** against the primary button's gray-900 background — invisible. Widen to `outline-2 outline-offset-2`, place outline outside the button via offset, and add a dark-mode `outline-white` so the ring is always visible against the page chrome regardless of the button surface. 2. Touch target (WCAG 2.5.5). Icon-only buttons at the default `:md` size were `w-9 h-9` = 36×36, below the 44×44 enhanced target. Bump `md.icon_container_classes` to `w-11 h-11` and `lg.icon_container_classes` to `w-12 h-12` to keep the size scale intact. `sm` stays at 32×32 (already passes WCAG 2.5.8 AA's 24×24 minimum; intentional compact-density variant). 3. Default button type. `content_tag(:button, ...)` inherits the HTML default `type="submit"`, so a DS::Button rendered inside a form steals Enter-key submission from the first text input (reproducible in the form stepper). Default to `type="button"` in the non-`href` branch; existing form submitters pass `type: "submit"` explicitly and continue to work. The `button_to` (href) branch keeps the submit default because button_to wraps its own form. 4. Icon-only accessible name. Icon-only buttons render no text node, so AT users hear "button" with no name. Derive a humanized aria-label from the icon key (e.g. `icon: "more-horizontal"` → `aria-label="More horizontal"`); explicit `aria: { label: }` on the caller still wins. Soft fallback — callers should still pass meaningful labels for richer copy. Plus: replace the stale `fg-white` icon class on the destructive variant with `text-inverse` (the `fg-*` namespace was deprecated in #1626 so `fg-white` resolved to nothing; the icon was using its helper-default color rather than the white the design intended). Out of scope: - Menu avatar trigger (custom 36×36 button bypassing DS::Button) — belongs to #1743 DS::Menu audit. - DS::FilledIcon `lg` size container (decorative, not interactive) — belongs to #1742.