chore(orbit): keyboard navigation across interactive modals

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/OrbitAccountPicker.tsx

@@ -1,4 +1,4 @@
-import { useEffect } from 'react';
+import { useEffect, useRef, useState } from 'react';
 import { createPortal } from 'react-dom';
 import { X, User } from 'lucide-react';
 import { useTranslation } from 'react-i18next';
@@ -13,13 +13,43 @@ import { useOrbitAccountPickerStore } from '../store/orbitAccountPickerStore';
 export default function OrbitAccountPicker() {
   const { t } = useTranslation();
   const { isOpen, accounts, pick, cancel } = useOrbitAccountPickerStore();
+  const [selected, setSelected] = useState(0);
+  const itemRefs = useRef<(HTMLButtonElement | null)[]>([]);
+
+  // Reset + focus first item each time the picker re-opens.
+  useEffect(() => {
+    if (!isOpen) return;
+    setSelected(0);
+    // Defer focus to the next tick so the DOM has actually mounted.
+    queueMicrotask(() => itemRefs.current[0]?.focus());
+  }, [isOpen]);
+
+  // Move DOM focus with the arrow-key selection so the browser's focus
+  // ring follows, and the currently active button is readable to AT.
+  useEffect(() => {
+    if (!isOpen) return;
+    itemRefs.current[selected]?.focus();
+  }, [selected, isOpen]);
 
   useEffect(() => {
     if (!isOpen) return;
-    const onKey = (e: KeyboardEvent) => { if (e.key === 'Escape') cancel(); };
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') { cancel(); return; }
+      if (e.key === 'ArrowDown') {
+        e.preventDefault();
+        setSelected(s => (s + 1) % Math.max(1, accounts.length));
+      } else if (e.key === 'ArrowUp') {
+        e.preventDefault();
+        setSelected(s => (s - 1 + accounts.length) % Math.max(1, accounts.length));
+      } else if (e.key === 'Enter') {
+        e.preventDefault();
+        const target = accounts[selected];
+        if (target) pick(target);
+      }
+    };
     window.addEventListener('keydown', onKey);
     return () => window.removeEventListener('keydown', onKey);
-  }, [isOpen, cancel]);
+  }, [isOpen, accounts, selected, pick, cancel]);
 
   if (!isOpen) return null;
 
@@ -42,13 +72,15 @@ export default function OrbitAccountPicker() {
         <p className="orbit-account-picker__sub">
           {t('orbit.accountPickerSub', { url: accounts[0]?.url ?? '' })}
         </p>
-        <ul className="orbit-account-picker__list">
-          {accounts.map(a => (
-            <li key={a.id}>
+        <ul className="orbit-account-picker__list" role="listbox">
+          {accounts.map((a, i) => (
+            <li key={a.id} role="option" aria-selected={i === selected}>
               <button
+                ref={el => { itemRefs.current[i] = el; }}
                 type="button"
-                className="orbit-account-picker__item"
+                className={`orbit-account-picker__item${i === selected ? ' is-active' : ''}`}
                 onClick={() => pick(a)}
+                onMouseEnter={() => setSelected(i)}
               >
                 <User size={14} />
                 <span className="orbit-account-picker__user">{a.username}</span>

src/components/OrbitExitModal.tsx

@@ -1,3 +1,4 @@
+import { useEffect } from 'react';
 import { createPortal } from 'react-dom';
 import { useTranslation } from 'react-i18next';
 import { useOrbitStore } from '../store/orbitStore';
@@ -26,7 +27,29 @@ export default function OrbitExitModal() {
   const isKicked      = phase === 'error' && errorMessage === 'kicked';
   const isRemoved     = phase === 'error' && errorMessage === 'removed';
   const isHostTimeout = phase === 'error' && errorMessage === 'host-timeout';
-  if (!isEnded && !isKicked && !isRemoved && !isHostTimeout) return null;
+  const isOpen = isEnded || isKicked || isRemoved || isHostTimeout;
+
+  const onOk = async () => {
+    try {
+      if (role === 'guest') await leaveOrbitSession();
+      else useOrbitStore.getState().reset();
+    } catch {
+      useOrbitStore.getState().reset();
+    }
+  };
+
+  // Modal is informational with a single action — Enter / Escape both fire OK.
+  useEffect(() => {
+    if (!isOpen) return;
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === 'Enter' || e.key === 'Escape') { e.preventDefault(); void onOk(); }
+    };
+    window.addEventListener('keydown', onKey);
+    return () => window.removeEventListener('keydown', onKey);
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [isOpen]);
+
+  if (!isOpen) return null;
 
   const title = isKicked
     ? t('orbit.exitKickedTitle')
@@ -43,15 +66,6 @@ export default function OrbitExitModal() {
         ? t('orbit.exitHostTimeoutBody', { host: hostName ?? '', name: sessionName ?? '' })
         : t('orbit.exitEndedBody',   { name: sessionName ?? '' });
 
-  const onOk = async () => {
-    try {
-      if (role === 'guest') await leaveOrbitSession();
-      else useOrbitStore.getState().reset();
-    } catch {
-      useOrbitStore.getState().reset();
-    }
-  };
-
   return createPortal(
     <div
       className="modal-overlay orbit-exit-overlay"
@@ -64,7 +78,7 @@ export default function OrbitExitModal() {
         <h3 id="orbit-exit-title" className="orbit-exit-modal__title">{title}</h3>
         <p className="orbit-exit-modal__body">{body}</p>
         <div className="orbit-exit-modal__actions">
-          <button type="button" className="btn btn-primary" onClick={onOk}>{t('orbit.exitOk')}</button>
+          <button type="button" className="btn btn-primary" onClick={onOk} autoFocus>{t('orbit.exitOk')}</button>
         </div>
       </div>
     </div>,

src/components/OrbitHelpModal.tsx

@@ -1,4 +1,4 @@
-import { useEffect } from 'react';
+import { useEffect, useRef } from 'react';
 import { createPortal } from 'react-dom';
 import {
   X, Sparkles, Users, Share2, LogIn, MousePointerClick,
@@ -17,10 +17,34 @@ import SettingsSubSection from './SettingsSubSection';
 export default function OrbitHelpModal() {
   const { t } = useTranslation();
   const { isOpen, close } = useHelpModalStore();
+  const bodyRef = useRef<HTMLDivElement>(null);
 
   useEffect(() => {
     if (!isOpen) return;
-    const onKey = (e: KeyboardEvent) => { if (e.key === 'Escape') close(); };
+    // Focus the first accordion summary so arrow keys work immediately.
+    queueMicrotask(() => {
+      const first = bodyRef.current?.querySelector<HTMLElement>('summary');
+      first?.focus();
+    });
+  }, [isOpen]);
+
+  useEffect(() => {
+    if (!isOpen) return;
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') { close(); return; }
+      if (e.key !== 'ArrowDown' && e.key !== 'ArrowUp') return;
+      const summaries = Array.from(
+        bodyRef.current?.querySelectorAll<HTMLElement>('summary') ?? [],
+      );
+      if (summaries.length === 0) return;
+      const current = document.activeElement as HTMLElement | null;
+      const idx = summaries.indexOf(current as HTMLElement);
+      e.preventDefault();
+      const next = e.key === 'ArrowDown'
+        ? summaries[(idx + 1 + summaries.length) % summaries.length]
+        : summaries[(idx - 1 + summaries.length) % summaries.length];
+      next?.focus();
+    };
     window.addEventListener('keydown', onKey);
     return () => window.removeEventListener('keydown', onKey);
   }, [isOpen, close]);
@@ -48,7 +72,7 @@ export default function OrbitHelpModal() {
         </h3>
         <p className="orbit-help-modal__intro">{t('orbit.helpIntro')}</p>
 
-        <div className="orbit-help-modal__body">
+        <div className="orbit-help-modal__body" ref={bodyRef}>
           <SettingsSubSection title={t('orbit.helpSec1Title')} icon={<Sparkles size={16} />}>
             <p>{t('orbit.helpSec1Body')}</p>
           </SettingsSubSection>

src/components/OrbitStartModal.tsx

@@ -137,6 +137,12 @@ export default function OrbitStartModal({ onClose }: Props) {
               autoFocus
               value={name}
               onChange={e => { setName(e.target.value); setHasCopied(false); }}
+              onKeyDown={e => {
+                if (e.key !== 'Enter') return;
+                if (busy || !name.trim()) return;
+                e.preventDefault();
+                void onStart();
+              }}
               placeholder={t('orbit.namePlaceholder')}
               maxLength={40}
               className="orbit-start-modal__input"