feat(a11y): screen-reader & keyboard accessibility across the panel (#5486) (#5652)

* feat(a11y): label list, toolbar & dashboard actions for screen readers

Phase 1 of #5486 (Android TalkBack support). Icon-only controls across
the management surfaces previously announced only their untranslated
icon name (e.g. "edit", "ellipsis") or nothing at all.

- Add aria-label to icon-only row-action and toolbar buttons across
  inbounds, clients, groups, hosts, nodes and xray
  (outbounds/routing/dns/balancers) lists, plus the dashboard cards.
- Make clickable bare icons and AntD Card actions keyboard-operable via
  role/tabIndex + Enter/Space (new activateOnKey helper); convert mobile
  dropdown triggers to buttons so they open from the keyboard.
- Fix the sidebar hamburger's mislabeled aria-label (was the dashboard
  label) and translate previously-hardcoded outbound menu labels.

New i18n keys in all 13 locales: sort, menu.openMenu,
pages.xray.outbound.moveToTop.

* feat(a11y): label modal, QR and copy/download controls for screen readers

Phase 2 of #5486. Modal and overlay controls relied on tooltips (not a
reliable accessible name) or were bare clickable icons with no keyboard
or screen-reader support.

- Add aria-label to copy/QR/download/info icon buttons in the inbound and
  client info modals, sub-links modal, QR panel, backup/log modals, and
  to the bare search/select inputs of the attach/detach client modals.
- Make click-to-copy QR codes and the IP-log refresh/clear, geofile
  reload and log refresh icons keyboard-operable (role/tabIndex +
  Enter/Space) with translated labels.
- Label the 2FA code input; drop the QrPanel download-image string
  fallback now that the key exists.

New i18n key in all 13 locales: downloadImage.

* feat(a11y): label form fields and shared form components for screen readers

Phase 3 of #5486. Form controls and shared form widgets were largely
unlabelled, and several remove controls were not keyboard-operable.

- SettingListItem now ties its title to the control via aria-labelledby,
  giving accessible names to the ~90 settings-tab inputs at once.
- InputAddon gains button semantics (role/tabIndex/Enter+Space) and an
  ariaLabel prop when used as an interactive remove control.
- Sparkline charts expose a role="img" summary of their latest values.
- Add aria-label to add/remove/regenerate icon buttons and bare
  inputs/selects across inbound, client and xray (dns/routing/balancer/
  outbound) forms; make clickable remove icons keyboard-operable; mark
  decorative help/target icons aria-hidden; label the JSON editor,
  date-time clear button, header-map remove, notification select-all and
  remark token chips.

New i18n keys in all 13 locales: regenerate, jsonEditor,
pages.xray.balancer.{costMatch,costValue,costRegexp}.

* chore(a11y): add eslint-plugin-jsx-a11y harness and fix flagged interactions

Phase 4 of #5486. Adds eslint-plugin-jsx-a11y (recommended ruleset,
scoped to .tsx) so screen-reader/keyboard regressions fail lint.

- Make the mobile node-card header a proper keyboard disclosure
  (role=button, aria-expanded, Enter/Space activation that ignores
  clicks on the nested action buttons) and drop the now-redundant
  stop-propagation click handlers the linter flagged on card-action
  wrappers in the node, client and inbound mobile cards.
- Disable jsx-a11y/no-autofocus: the autofocus on the login field and
  modal primary inputs is intentional focus management that helps
  screen-reader and keyboard users land on the right control.

make lint passes with the a11y ruleset enforced.

* feat(a11y): cover remaining deferred spots (settings tabs, sockopt, API docs)

Completes the panel sweep for #5486 by labelling the spots previously
left out of phases 1-4:

- NotifyTimeField (Telegram notifications): the mode, interval, unit and
  custom-cron inputs now carry aria-labels.
- The Sockopt toggle in transport options.
- Settings category tabs in icons-only (mobile) mode now expose the tab
  name as the icon's aria-label instead of the raw icon name.
- The Swagger API-docs view is wrapped in a labelled region landmark.

New i18n keys in all 13 locales: pages.settings.notifyTime.{interval,unit}.

* feat(a11y): label shared xray form components and remark field

Code review surfaced frontend/src/lib/xray/forms/ — shared form components
used by the host and inbound JSON forms — which the initial audit missed.

- FinalMaskForm (TCP/UDP final-mask editor): label the icon-only add and
  regenerate buttons and make all six remove icons keyboard-operable
  (role/tabIndex/Enter+Space); adds useTranslation to its sub-components.
- CustomSockoptList: the remove icon is now keyboard-operable.
- SniffingFields: aria-label on the otherwise label-less destOverride select.
- RemarkTemplateField: aria-label on the remark-variable picker button.

New i18n key in all 13 locales: pages.inbounds.sniffingDestOverride.

* feat(a11y): label client info modal and WireGuard config block

After rebasing onto the WireGuard client-config feature, re-apply the
ClientInfoModal copy/QR/IP-log aria-labels (the modal was restructured
upstream, so the original labels did not carry over) and label the new
ConfigBlock component's copy/download/QR actions. ConfigBlock's action
wrapper keeps its stop-propagation handler (a non-interactive guard for
the Collapse header) under a scoped jsx-a11y exception.

* fix(frontend): let npm install jsx-a11y under ESLint 10

eslint-plugin-jsx-a11y@6.10.2 declares a peer range that stops at ESLint 9,
but the panel is on ESLint 10, so `npm ci` aborts with ERESOLVE even though
the plugin runs fine on ESLint 10 with flat config. Add an npm override so
jsx-a11y accepts the project's ESLint version. This keeps normal peer
resolution (recharts' react-is peer still auto-installs) — no global
legacy-peer-deps and no manual react-is pin needed.

* fix(a11y): size mobile row triggers and move node expand role to chevron

Address automated review on #5652:
- add size="small" to the inbound/client/node mobile-card "more" dropdown
  triggers so they match the adjacent small Switch and the established
  desktop RowActions pattern.
- move the node card-head disclosure semantics (role/tabIndex/aria-expanded/
  keyboard) onto the chevron affordance so the expand control is no longer a
  role="button" wrapping the Switch, info button and dropdown. Mouse
  click-anywhere-to-expand is preserved on the header div.

frontend/src/components/form/DateTimePicker.tsx

@@ -1,4 +1,5 @@
 import { useEffect, useMemo, useRef, useState } from 'react';
+import { useTranslation } from 'react-i18next';
 import { CloseCircleFilled } from '@ant-design/icons';
 import { DatePicker } from 'antd';
 import dayjs from 'dayjs';
@@ -53,6 +54,7 @@ export default function DateTimePicker({
   placeholder = '',
   disabled = false,
 }: DateTimePickerProps) {
+  const { t } = useTranslation();
   const { datepicker } = useDatepicker();
   const { isDark, isUltra } = useTheme();
   const jalaliRef = useRef<HTMLDivElement>(null);
@@ -100,7 +102,7 @@ export default function DateTimePicker({
           <button
             type="button"
             className="jdp-clear"
-            aria-label="clear"
+            aria-label={t('clear')}
             onMouseDown={(e) => e.preventDefault()}
             onClick={(e) => {
               e.stopPropagation();

frontend/src/components/form/HeaderMapEditor.tsx

@@ -1,4 +1,5 @@
 import { useEffect, useRef, useState } from 'react';
+import { useTranslation } from 'react-i18next';
 import { Button, Input, Space } from 'antd';
 import { MinusOutlined, PlusOutlined } from '@ant-design/icons';
 
@@ -74,6 +75,7 @@ function rowsToMap(rows: HeaderRow[], mode: HeaderMapMode): Record<string, strin
 }
 
 export default function HeaderMapEditor({ mode, value, onChange }: HeaderMapEditorProps) {
+  const { t } = useTranslation();
   // Local state holds rows including blanks. Without it, addRow() would
   // append a {name:'', value:''} that rowsToMap immediately filters out
   // before reaching the form, so the new row would never reach UI. The
@@ -130,7 +132,7 @@ export default function HeaderMapEditor({ mode, value, onChange }: HeaderMapEdit
             placeholder="Value"
             onChange={(e) => setRow(idx, { value: e.target.value })}
           />
-          <Button icon={<MinusOutlined />} onClick={() => removeRow(idx)} />
+          <Button aria-label={t('remove')} icon={<MinusOutlined />} onClick={() => removeRow(idx)} />
         </Space.Compact>
       ))}
       <Button size="small" type="primary" icon={<PlusOutlined />} onClick={addRow}>

frontend/src/components/form/JsonEditor.tsx

@@ -1,4 +1,5 @@
 import { forwardRef, useEffect, useImperativeHandle, useRef } from 'react';
+import { useTranslation } from 'react-i18next';
 import { EditorView, basicSetup } from 'codemirror';
 import { EditorState, Compartment } from '@codemirror/state';
 import { json, jsonParseLinter } from '@codemirror/lang-json';
@@ -92,6 +93,7 @@ const JsonEditor = forwardRef<JsonEditorHandle, JsonEditorProps>(function JsonEd
   const onChangeRef = useRef(onChange);
   const valueRef = useRef(value);
   const { isDark, isUltra } = useTheme();
+  const { t } = useTranslation();
 
   useEffect(() => {
     onChangeRef.current = onChange;
@@ -173,7 +175,7 @@ const JsonEditor = forwardRef<JsonEditorHandle, JsonEditorProps>(function JsonEd
     });
   }, [readOnly]);
 
-  return <div ref={hostRef} className="json-editor-host" />;
+  return <div ref={hostRef} className="json-editor-host" aria-label={t('jsonEditor')} />;
 });
 
 export default JsonEditor;

frontend/src/components/form/RemarkTemplateField.tsx

@@ -55,7 +55,7 @@ export default function RemarkTemplateField({ value = '', onChange, maxLength, p
             title={t('pages.hosts.remarkVars.title')}
           >
             <Tooltip title={t('pages.hosts.remarkVars.title')}>
-              <Button type="text" size="small" icon={<CodeOutlined />} style={{ margin: '0 -7px' }} />
+              <Button type="text" size="small" icon={<CodeOutlined />} aria-label={t('pages.hosts.remarkVars.title')} style={{ margin: '0 -7px' }} />
             </Tooltip>
           </Popover>
         }

frontend/src/components/form/RemarkVarPicker.tsx

@@ -2,6 +2,7 @@ import { Tag, Tooltip, Typography } from 'antd';
 import { useTranslation } from 'react-i18next';
 
 import { REMARK_VARIABLES, REMARK_VAR_GROUPS, wrapToken } from '@/lib/remark/remarkVariables';
+import { activateOnKey } from '@/utils/a11y';
 
 interface RemarkVarPickerProps {
   /** Called with the bare token (e.g. "EMAIL") when a chip is clicked. */
@@ -28,7 +29,10 @@ export default function RemarkVarPicker({ onPick }: RemarkVarPickerProps) {
             {REMARK_VARIABLES.filter((v) => v.group === group).map((v) => (
               <Tooltip key={v.token} title={t(`pages.hosts.remarkVars.desc${v.token}`)}>
                 <Tag
+                  role="button"
+                  tabIndex={0}
                   onClick={() => onPick(v.token)}
+                  onKeyDown={activateOnKey(() => onPick(v.token))}
                   style={{ cursor: 'pointer', margin: 0, fontFamily: 'monospace' }}
                 >
                   {wrapToken(v.token)}