feat(ui): accessibility pass — WCAG 2.2 AA for login/lobby/shell (F2)

Add the a11y foundation and bring login, lobby, and the in-game shell to WCAG 2.2 AA: - Primitives: .sr-only + .skip-link (base.css), trapFocus (modal focus trap + restore) and restoreFocus (menu focus restore) actions, the --color-focus visible ring. - In-game shell: skip link + focusable main landmark; WAI-ARIA sidebar tabs (roving tabindex, arrow/Home/End, tabpanel wiring); menu Escape + focus restore (account / view / turn-navigator / map-toggles / bottom-tabs); mail compose as a role=dialog modal with a focus trap. - login / lobby / lobby-create: skip link + main landmark, field labels, role=alert / role=status live regions. - Map canvas: aria-label naming it a visual overview, with its data reachable by keyboard via the sidebar inspector and tables (accessible alternative; in-canvas keyboard nav deferred). Gates (chromium-desktop): tests/e2e/a11y-axe.spec.ts scans every top-level view for WCAG 2.2 AA violations (zero); a11y-keyboard.spec.ts covers the skip link, menu Escape+restore, and tab roving. Adds @axe-core/playwright. Docs: ui/docs/a11y.md (+ index). Marks F1 and F2 done in ui/PLAN-finalize.md. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-22 08:25:14 +02:00
parent dcc655c7c4
commit 642c5b7322
25 changed files with 559 additions and 46 deletions
@@ -0,0 +1,34 @@
+/**
+ * Focus restoration for transient popovers and menus.
+ *
+ * `restoreFocus` is a Svelte action for a surface that is rendered only
+ * while open (an `{#if open}` popover/menu/drawer). On mount it records
+ * the element that had focus — the trigger that opened it — and on
+ * destroy it returns focus there, so dismissing the surface (Escape,
+ * outside click, or selecting an item) never drops keyboard focus to the
+ * document body.
+ *
+ * Unlike `trapFocus`, it neither traps focus nor moves it into the
+ * surface: menus are non-modal, so the user tabs in only if they want.
+ * Focus is restored only when it would otherwise be lost (it is inside
+ * the closing surface or already on `<body>`); if the user has
+ * deliberately moved focus to another control, that choice is left
+ * alone.
+ */
+export function restoreFocus(node: HTMLElement): { destroy(): void } {
+	const trigger =
+		document.activeElement instanceof HTMLElement
+			? document.activeElement
+			: null;
+
+	return {
+		destroy(): void {
+			const active = document.activeElement;
+			const lost =
+				active === null ||
+				active === document.body ||
+				node.contains(active);
+			if (lost) trigger?.focus();
+		},
+	};
+}