diff --git a/src/frontend/app.js b/src/frontend/app.js
index 9c65d1d..6e6cc71 100644
--- a/src/frontend/app.js
+++ b/src/frontend/app.js
@@ -1416,7 +1416,8 @@ function renderCard(s, idx) {
     return '<span class="tag-pill tag-' + escHtml(t) + '" onclick="event.stopPropagation();removeTag(\'' + s.id + '\',\'' + t + '\')">' + escHtml(t) + ' &times;</span>';
   }).join('');
 
-  var html = '<div class="' + classes + '" data-id="' + s.id + '" onclick="onCardClick(\'' + s.id + '\', event)">';
+  var cardLabel = escHtml(projName + ': ' + getSessionDisplayName(s).slice(0, 80) + ' — ' + toolLabel + ', ' + timeAgo(s.last_ts));
+  var html = '<div class="' + classes + '" data-id="' + s.id + '" tabindex="0" aria-label="' + cardLabel + '" onclick="onCardClick(\'' + s.id + '\', event)" onkeydown="onCardKeydown(event)">';
   html += '<div class="card-top">';
   html += '<input type="checkbox" class="card-checkbox" style="' + checkboxStyle + '" ' + (isSelected ? 'checked' : '') + ' onclick="toggleSelect(\'' + s.id + '\', event)">';
   html += renderToolBadges(s.tool, s);
@@ -1519,7 +1520,8 @@ function renderListCard(s, idx) {
   if (isSelected) classes += ' selected';
   if (isFocused) classes += ' focused';
 
-  var html = '<div class="' + classes + '" data-id="' + s.id + '" onclick="onCardClick(\'' + s.id + '\', event)">';
+  var listLabel = escHtml(projName + ': ' + getSessionDisplayName(s).slice(0, 80) + ' — ' + getToolLabel(s.tool, true) + ', ' + timeAgo(s.last_ts));
+  var html = '<div class="' + classes + '" data-id="' + s.id + '" tabindex="0" aria-label="' + listLabel + '" onclick="onCardClick(\'' + s.id + '\', event)" onkeydown="onCardKeydown(event)">';
   html += renderToolBadges(s.tool, s);
   if (showBadges && s.mcp_servers && s.mcp_servers.length > 0) {
     s.mcp_servers.forEach(function(m) {
@@ -1652,6 +1654,21 @@ function onCardClick(id, event) {
   }
 }
 
+// Session cards (.card / .list-row / .qa-item) are plain divs with nested
+// interactive controls (checkbox, star, tag, launch buttons) — not real
+// <button>s, so Enter/Space don't activate them for free like a native
+// button would. This makes the card itself keyboard-activatable while
+// leaving its nested controls' own native key handling alone: only react
+// when the key event's target IS the card (not a bubbled event from a
+// descendant button/checkbox, which already handles its own Enter/Space).
+function onCardKeydown(e) {
+  if (e.target !== e.currentTarget) return;
+  if (e.key === 'Enter' || e.key === ' ') {
+    e.preventDefault();
+    e.currentTarget.click(); // reuses the card's own onclick handler
+  }
+}
+
 // ── Rendering: Main ────────────────────────────────────────────
 
 function render() {
@@ -1909,7 +1926,8 @@ function renderQACard(s, idx) {
   var costStr = cost > 0 ? '~$' + cost.toFixed(2) : '';
   var classes = 'qa-item' + (selectedIds.has(s.id) ? ' selected' : '');
 
-  var html = '<div class="' + classes + '" data-id="' + s.id + '" onclick="onCardClick(\'' + s.id + '\', event)">';
+  var qaLabel = escHtml(getSessionDisplayName(s).slice(0, 100) + ' — ' + toolLabel + ', ' + timeAgo(s.last_ts));
+  var html = '<div class="' + classes + '" data-id="' + s.id + '" tabindex="0" aria-label="' + qaLabel + '" onclick="onCardClick(\'' + s.id + '\', event)" onkeydown="onCardKeydown(event)">';
   html += renderToolBadges(s.tool, s);
   html += '<span class="qa-question">' + escHtml(getSessionDisplayName(s).slice(0, 160)) + '</span>';
   html += '<span class="qa-meta">';
@@ -4027,9 +4045,10 @@ function _installModalFocusTrap(overlay) {
   _modalTrapFn = function(e) {
     if (e.key === 'Escape') {
       e.stopPropagation();
-      // Both modals route close through the same callback chain.
+      // All three modals route close through the same callback chain.
       if (overlay.id === 'projectsSettingsOverlay') closeProjectsSettings();
       else if (overlay.id === 'addProjectOverlay' && typeof closeAddProject === 'function') closeAddProject();
+      else if (overlay.id === 'detailPanel' && typeof closeDetail === 'function') closeDetail();
       return;
     }
     if (e.key !== 'Tab') return;
@@ -4050,7 +4069,12 @@ function _uninstallModalFocusTrap() {
     document.removeEventListener('keydown', _modalTrapFn, true);
     _modalTrapFn = null;
   }
-  if (_modalFocusReturn && _modalFocusReturn.focus) {
+  // A background poll/re-render (e.g. the 5s active-sessions refresh) can
+  // rebuild the session grid while the modal was open, detaching the node we
+  // captured. Focusing a detached element is a silent no-op that strands
+  // focus wherever it happened to be (often the modal's own now-hidden close
+  // button) — check it's still on the page first.
+  if (_modalFocusReturn && _modalFocusReturn.focus && document.body.contains(_modalFocusReturn)) {
     try { _modalFocusReturn.focus(); } catch (e) {}
   }
   _modalFocusReturn = null;
@@ -4313,7 +4337,14 @@ function closeAddProject() {
 function addProjectSwitchTab(tab) {
   ['local', 'owned', 'contributing'].forEach(function(t) {
     var btn = document.querySelector('.ap-tab[data-tab="' + t + '"]');
-    if (btn) btn.classList.toggle('active', t === tab);
+    if (!btn) return;
+    var isActive = t === tab;
+    btn.classList.toggle('active', isActive);
+    // WAI-ARIA tab pattern: aria-selected + roving tabindex must track the
+    // active tab, not just the visual .active class — otherwise a screen
+    // reader keeps announcing the first tab as selected forever.
+    btn.setAttribute('aria-selected', isActive ? 'true' : 'false');
+    btn.setAttribute('tabindex', isActive ? '0' : '-1');
   });
   document.getElementById('apPaneLocal').style.display = tab === 'local' ? '' : 'none';
   document.getElementById('apPaneOwned').style.display = tab === 'owned' ? '' : 'none';
@@ -4328,6 +4359,28 @@ function addProjectSwitchTab(tab) {
   }
 }
 
+// Left/Right cycle between the three Add Project tabs, Home/End jump to ends
+// — same WAI-ARIA tablist behavior as the Projects/History subtab strip
+// (onProjectsSubtabKey). Wired via the tablist's onkeydown in index.html.
+var AP_TAB_ORDER = ['local', 'owned', 'contributing'];
+function onAddProjectTabKey(e) {
+  var k = e.key;
+  if (k !== 'ArrowLeft' && k !== 'ArrowRight' && k !== 'Home' && k !== 'End') return;
+  e.preventDefault();
+  var current = document.querySelector('.ap-tab.active');
+  var idx = current ? AP_TAB_ORDER.indexOf(current.getAttribute('data-tab')) : 0;
+  if (idx < 0) idx = 0;
+  var next;
+  if (k === 'Home') next = 0;
+  else if (k === 'End') next = AP_TAB_ORDER.length - 1;
+  else if (k === 'ArrowRight') next = (idx + 1) % AP_TAB_ORDER.length;
+  else next = (idx - 1 + AP_TAB_ORDER.length) % AP_TAB_ORDER.length;
+  var nextTab = AP_TAB_ORDER[next];
+  addProjectSwitchTab(nextTab);
+  var btn = document.querySelector('.ap-tab[data-tab="' + nextTab + '"]');
+  if (btn) btn.focus();
+}
+
 async function submitAddLocalProject() {
   var input = document.getElementById('apLocalPath');
   var err = document.getElementById('apLocalError');
diff --git a/src/frontend/calendar.js b/src/frontend/calendar.js
index f6f5a46..447c448 100644
--- a/src/frontend/calendar.js
+++ b/src/frontend/calendar.js
@@ -11,7 +11,7 @@ function toggleCalendar() {
   var btn = document.getElementById('dateBtn');
   if (!popup || !btn) return;
   if (popup.classList.contains('open')) {
-    popup.classList.remove('open');
+    closeCalendar();
     return;
   }
   renderCalendar();
@@ -26,16 +26,40 @@ function toggleCalendar() {
   popup.style.left = left + 'px';
   popup.style.top = (rect.bottom + 4) + 'px';
   popup.classList.add('open');
+  btn.setAttribute('aria-expanded', 'true');
+  // Move focus into the dialog (it's a real dialog now — role="dialog" +
+  // aria-modal) so keyboard/screen-reader users land inside it, not on
+  // whatever was behind the button.
+  popup.focus();
   setTimeout(function() {
     document.addEventListener('click', closeCalendarOutside, { once: true });
   }, 0);
 }
 
+// Closes the popup and — unless the trigger button itself is what's about to
+// receive focus anyway (a plain outside click on unrelated UI) — returns
+// focus to the date button, so a keyboard user isn't dropped onto <body>.
+function closeCalendar(returnFocus) {
+  var popup = document.getElementById('calendarPopup');
+  var btn = document.getElementById('dateBtn');
+  if (!popup) return;
+  popup.classList.remove('open');
+  if (btn) btn.setAttribute('aria-expanded', 'false');
+  if (returnFocus !== false && btn) btn.focus();
+}
+
+function onCalendarPopupKeydown(e) {
+  if (e.key === 'Escape') {
+    e.stopPropagation();
+    closeCalendar();
+  }
+}
+
 function closeCalendarOutside(e) {
   var popup = document.getElementById('calendarPopup');
   var btn = document.getElementById('dateBtn');
   if (popup && !popup.contains(e.target) && btn && !btn.contains(e.target)) {
-    popup.classList.remove('open');
+    closeCalendar(false); // the click already moved focus elsewhere — don't fight it
   } else if (popup && popup.classList.contains('open')) {
     document.addEventListener('click', closeCalendarOutside, { once: true });
   }
@@ -64,28 +88,31 @@ function renderCalendar() {
 
   var prevLastDay = new Date(calYear, calMonth, 0).getDate();
   for (var i = startWeekday - 1; i >= 0; i--) {
-    html += '<div class="cal-day other-month">' + (prevLastDay - i) + '</div>';
+    html += '<div class="cal-day other-month" aria-hidden="true">' + (prevLastDay - i) + '</div>';
   }
 
   for (var d = 1; d <= daysInMonth; d++) {
     var dateStr = calYear + '-' + String(calMonth+1).padStart(2,'0') + '-' + String(d).padStart(2,'0');
     var cls = 'cal-day';
+    var selected = false;
     if (dateStr === todayStr) cls += ' today';
     if (calStart && calEnd) {
-      if (dateStr === calStart) cls += ' range-start';
-      if (dateStr === calEnd) cls += ' range-end';
+      if (dateStr === calStart) { cls += ' range-start'; selected = true; }
+      if (dateStr === calEnd) { cls += ' range-end'; selected = true; }
       if (dateStr > calStart && dateStr < calEnd) cls += ' in-range';
       if (calStart === calEnd && dateStr === calStart) cls += ' range-start range-end';
     } else if (calStart && dateStr === calStart) {
       cls += ' range-start range-end';
+      selected = true;
     }
-    html += '<div class="' + cls + '" onclick="event.stopPropagation();calPickDay(\'' + dateStr + '\')">' + d + '</div>';
+    html += '<button type="button" class="' + cls + '" aria-pressed="' + selected + '" ' +
+      'onclick="event.stopPropagation();calPickDay(\'' + dateStr + '\')">' + d + '</button>';
   }
 
   var totalCells = startWeekday + daysInMonth;
   var remaining = (7 - (totalCells % 7)) % 7;
   for (var n = 1; n <= remaining; n++) {
-    html += '<div class="cal-day other-month">' + n + '</div>';
+    html += '<div class="cal-day other-month" aria-hidden="true">' + n + '</div>';
   }
   html += '</div>';
 
@@ -147,8 +174,7 @@ function calPreset(days) {
   }
   renderCalendar();
   onDateFilter();
-  var popup = document.getElementById('calendarPopup');
-  if (popup) popup.classList.remove('open');
+  closeCalendar(false); // the preset button stays visually in place; no need to yank focus
 }
 
 function updateDateBtn() {
diff --git a/src/frontend/detail.js b/src/frontend/detail.js
index 3fb7cd1..92d9e6e 100644
--- a/src/frontend/detail.js
+++ b/src/frontend/detail.js
@@ -102,6 +102,10 @@ async function openDetail(s) {
 
   panel.classList.add('open');
   overlay.classList.add('open');
+  // Detail is a real dialog (role="dialog" aria-modal, index.html) — trap Tab
+  // inside it and return focus to whatever opened it on close, same helper
+  // the Add Project / Projects Settings modals use.
+  if (typeof _installModalFocusTrap === 'function') _installModalFocusTrap(panel);
 
   // Load messages
   if (s.has_detail) {
@@ -194,8 +198,10 @@ async function openDetail(s) {
 function closeDetail() {
   var panel = document.getElementById('detailPanel');
   var overlay = document.getElementById('overlay');
-  if (panel) panel.classList.remove('open');
+  if (!panel || !panel.classList.contains('open')) return; // already closed — don't steal focus back a 2nd time
+  panel.classList.remove('open');
   if (overlay) overlay.classList.remove('open');
+  if (typeof _uninstallModalFocusTrap === 'function') _uninstallModalFocusTrap();
 }
 
 var structuredMessageRenderers = {
diff --git a/src/frontend/index.html b/src/frontend/index.html
index 6d23236..b822a16 100644
--- a/src/frontend/index.html
+++ b/src/frontend/index.html
@@ -249,11 +249,11 @@
             <option value="deploy">deploy</option>
             <option value="review">review</option>
         </select>
-        <button class="toolbar-btn" id="dateBtn" onclick="toggleCalendar()" title="Date filter">
+        <button class="toolbar-btn" id="dateBtn" onclick="toggleCalendar()" title="Date filter" aria-haspopup="dialog" aria-expanded="false" aria-controls="calendarPopup">
             <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><rect x="3" y="4" width="18" height="18" rx="2"/><line x1="16" y1="2" x2="16" y2="6"/><line x1="8" y1="2" x2="8" y2="6"/><line x1="3" y1="10" x2="21" y2="10"/></svg>
             <span id="dateBtnLabel">All time</span>
         </button>
-        <div class="calendar-popup" id="calendarPopup"></div>
+        <div class="calendar-popup" id="calendarPopup" role="dialog" aria-modal="true" aria-label="Choose date range" tabindex="-1" onkeydown="onCalendarPopupKeydown(event)"></div>
         <button class="toolbar-btn" onclick="toggleGroup()" id="groupBtn">Group</button>
         <button class="toolbar-btn" onclick="toggleLayout()" id="layoutBtn" title="Grid / List">
             <svg id="layoutIcon" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><rect x="3" y="3" width="7" height="7"/><rect x="14" y="3" width="7" height="7"/><rect x="3" y="14" width="7" height="7"/><rect x="14" y="14" width="7" height="7"/></svg>
@@ -267,11 +267,11 @@
 </div>
 
 <div class="overlay" id="overlay" onclick="closeDetail()"></div>
-<div class="detail-panel" id="detailPanel">
+<div class="detail-panel" id="detailPanel" role="dialog" aria-modal="true" aria-labelledby="detailTitle">
     <div class="detail-resize-handle" id="detailResizeHandle"></div>
     <div class="detail-header">
         <strong id="detailTitle">Session Detail</strong>
-        <button class="detail-close" onclick="closeDetail()">&times;</button>
+        <button class="detail-close" onclick="closeDetail()" aria-label="Close session detail">&times;</button>
     </div>
     <div class="detail-body" id="detailBody"></div>
 </div>
@@ -292,10 +292,10 @@ <h3 id="confirmTitle">Delete Session?</h3>
 <div class="confirm-overlay" id="addProjectOverlay" role="dialog" aria-modal="true" aria-labelledby="apTitle" aria-hidden="true">
     <div class="confirm-box add-project-box">
         <h3 id="apTitle">Add project</h3>
-        <div class="ap-tabs" role="tablist" aria-label="Add project source">
-            <button class="ap-tab active" data-tab="local" role="tab" aria-selected="true" tabindex="0" onclick="addProjectSwitchTab('local')">Local path</button>
-            <button class="ap-tab" data-tab="owned" role="tab" aria-selected="false" tabindex="-1" onclick="addProjectSwitchTab('owned')">My GitHub repos</button>
-            <button class="ap-tab" data-tab="contributing" role="tab" aria-selected="false" tabindex="-1" onclick="addProjectSwitchTab('contributing')">Contributing</button>
+        <div class="ap-tabs" role="tablist" aria-label="Add project source" onkeydown="onAddProjectTabKey(event)">
+            <button class="ap-tab active" data-tab="local" role="tab" aria-selected="true" aria-controls="apPaneLocal" tabindex="0" onclick="addProjectSwitchTab('local')">Local path</button>
+            <button class="ap-tab" data-tab="owned" role="tab" aria-selected="false" aria-controls="apPaneOwned" tabindex="-1" onclick="addProjectSwitchTab('owned')">My GitHub repos</button>
+            <button class="ap-tab" data-tab="contributing" role="tab" aria-selected="false" aria-controls="apPaneContrib" tabindex="-1" onclick="addProjectSwitchTab('contributing')">Contributing</button>
         </div>
         <div class="ap-body">
             <div class="ap-pane" id="apPaneLocal" role="tabpanel">
diff --git a/src/frontend/styles.css b/src/frontend/styles.css
index ca847ad..1603e83 100644
--- a/src/frontend/styles.css
+++ b/src/frontend/styles.css
@@ -695,7 +695,7 @@ body[data-view="overview"] .toolbar { display: none; }
     box-shadow: 0 0 0 1px var(--accent-blue);
 }
 
-.card.focused {
+.card.focused, .card:focus-visible {
     outline: 2px solid var(--accent-blue);
     outline-offset: 2px;
 }
@@ -949,6 +949,7 @@ body[data-view="overview"] .toolbar { display: none; }
     z-index: 50;
 }
 .calendar-popup.open { display: block; }
+.calendar-popup:focus { outline: none; } /* dialog container itself isn't the visible target — the first day/nav control is */
 
 .cal-header {
     display: flex;
@@ -987,8 +988,10 @@ body[data-view="overview"] .toolbar { display: none; }
     cursor: pointer;
     color: var(--text-secondary);
     transition: all 0.1s;
+    background: none; border: none; font-family: inherit; width: 100%;
 }
 .cal-day:hover { background: rgba(255,255,255,0.08); color: var(--text-primary); }
+.cal-day:focus-visible { outline: 2px solid var(--accent-blue); outline-offset: -1px; }
 .cal-day.other-month { color: var(--text-muted); opacity: 0.3; }
 .cal-day.today { font-weight: 700; color: var(--accent-blue); }
 .cal-day.in-range { background: rgba(96,165,250,0.1); }
@@ -2225,6 +2228,7 @@ body[data-view="overview"] .toolbar { display: none; }
 .qa-item:last-child { border-bottom: none; }
 .qa-item:hover { background: var(--bg-card-hover); }
 .qa-item.selected { background: rgba(96, 165, 250, 0.08); }
+.qa-item:focus-visible { outline: 2px solid var(--accent-blue); outline-offset: -2px; }
 
 .qa-question {
     flex: 1;
@@ -3177,8 +3181,10 @@ body[data-view="overview"] .toolbar { display: none; }
     display: flex; flex-direction: column; gap: 6px; text-align: left;
     padding: 14px; background: var(--bg-card); border: 1px solid var(--border);
     border-radius: 12px; cursor: pointer; transition: border-color 0.15s;
+    font: inherit; width: 100%;
 }
 .ov-card:hover { border-color: var(--accent-blue); }
+.ov-card:focus-visible { outline: 2px solid var(--accent-blue); outline-offset: 2px; }
 .ov-card.limit { border-color: var(--accent-red); }
 .ov-card-top { display: flex; align-items: center; gap: 8px; }
 .ov-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-muted); }
@@ -3297,6 +3303,8 @@ body[data-view="overview"] .toolbar { display: none; }
 .ws-resizer-h::before { left: 0; right: 0; top: 50%; height: 2px; transform: translateY(-50%); }
 .ws-resizer:hover::before, .ws-resizer.dragging::before { background: var(--accent-blue); }
 .ws-resizer.dragging::before { box-shadow: 0 0 8px color-mix(in srgb, var(--accent-blue) 60%, transparent); }
+.ws-resizer:focus-visible::before { background: var(--accent-blue); box-shadow: 0 0 8px color-mix(in srgb, var(--accent-blue) 60%, transparent); }
+.ws-resizer:focus-visible { outline: none; } /* the ::before line itself is the focus indicator */
 
 .ws-pane {
     display: flex;
@@ -4417,7 +4425,7 @@ body[data-view="overview"] .toolbar { display: none; }
     border-color: var(--accent-blue);
 }
 
-.list-row.focused {
+.list-row.focused, .list-row:focus-visible {
     outline: 2px solid var(--accent-blue);
     outline-offset: -2px;
 }
diff --git a/src/frontend/workspace.js b/src/frontend/workspace.js
index 3c2b525..75c3948 100644
--- a/src/frontend/workspace.js
+++ b/src/frontend/workspace.js
@@ -750,10 +750,10 @@ function _wsPaneMarkup(pane) {
           'ondblclick="renameWorkspacePane(\'' + escHtml(pane.id) + '\')">connecting…</span>' +
         '<button class="ws-pane-ren" title="Rename this terminal" aria-label="Rename terminal" ' +
           'onclick="renameWorkspacePane(\'' + escHtml(pane.id) + '\')">&#9998;</button>' +
-        '<select class="ws-pane-launch" title="Launch an agent or saved command in this pane" ' +
+        '<select class="ws-pane-launch" title="Launch an agent or saved command in this pane" aria-label="Launch an agent or saved command in this pane" ' +
           'onchange="launchAgentInPane(\'' + escHtml(pane.id) + '\', this.value); this.selectedIndex=0;">' + _wsLaunchOptionsHtml() + '</select>' +
         '<button class="ws-pane-bm" title="Bookmark this folder + agent" aria-label="Bookmark" onclick="bookmarkPane(\'' + escHtml(pane.id) + '\')">&#9734;</button>' +
-        '<button class="ws-pane-close" title="Close pane" onclick="closeWorkspacePane(\'' + escHtml(pane.id) + '\')">&times;</button>' +
+        '<button class="ws-pane-close" title="Close pane" aria-label="Close pane" onclick="closeWorkspacePane(\'' + escHtml(pane.id) + '\')">&times;</button>' +
       '</div>' +
       '<div class="ws-pane-term" id="wsTermHost-' + escHtml(pane.id) + '"></div>' +
       '<div class="ws-restore-banner" id="wsRestore-' + escHtml(pane.id) + '" hidden></div>' +
@@ -1252,7 +1252,7 @@ function _wsTabMarkup(tab) {
       'title="Drag to reorder · double-click to rename">' +
       '<span class="ws-tab-name">' + escHtml(tab.name) + '</span>' +
       '<button class="ws-tab-rename-btn" title="Rename terminal" aria-label="Rename terminal" onclick="event.stopPropagation();renameWorkspaceTab(\'' + id + '\')">&#9998;</button>' +
-      '<button class="ws-tab-close" title="Close tab" onclick="event.stopPropagation();closeWorkspaceTab(\'' + id + '\')">&times;</button>' +
+      '<button class="ws-tab-close" title="Close tab" aria-label="Close tab" onclick="event.stopPropagation();closeWorkspaceTab(\'' + id + '\')">&times;</button>' +
     '</div>';
 }
 
@@ -1448,6 +1448,47 @@ function _wsMakeResizer(grid, tab, dir, pos, gr, idx) {
   h.className = 'ws-resizer ws-resizer-' + dir;
   if (dir === 'v') { h.style.left = pos + 'px'; }
   else { h.style.top = pos + 'px'; }
+  // Pointer-only by default (like a native <input type=range> splitter with
+  // no keyboard equivalent) — make it a real ARIA separator so arrow keys
+  // can resize too, not just drag.
+  h.tabIndex = 0;
+  h.setAttribute('role', 'separator');
+  h.setAttribute('aria-orientation', dir === 'v' ? 'vertical' : 'horizontal');
+  h.setAttribute('aria-label', dir === 'v' ? 'Resize panes (left/right arrow keys)' : 'Resize panes (up/down arrow keys)');
+  h.addEventListener('keydown', function (e) {
+    var forward = (dir === 'v') ? e.key === 'ArrowRight' : e.key === 'ArrowDown';
+    var backward = (dir === 'v') ? e.key === 'ArrowLeft' : e.key === 'ArrowUp';
+    if (!forward && !backward) return;
+    e.preventDefault();
+    var els = tab.panes.map(function (p) { return grid.querySelector('.ws-pane[data-pane-id="' + p.id + '"]'); });
+    var gr2 = grid.getBoundingClientRect();
+    var arr = (dir === 'v') ? tab.cols : tab.rows;
+    var a = idx, b = idx + 1;
+    var sum = arr[a] + arr[b];
+    var startPx, endPx;
+    if (dir === 'v') {
+      startPx = els[a].getBoundingClientRect().left;
+      endPx = els[b].getBoundingClientRect().right;
+    } else {
+      startPx = els[0].getBoundingClientRect().top;
+      endPx = els[2].getBoundingClientRect().bottom;
+    }
+    var S = endPx - startPx;
+    if (S < 2 * _WS_MIN_PANE_PX) return;
+    var curRel = (arr[a] / sum) * S;
+    var stepPx = Math.max(8, S * 0.05); // ~5% of the two tracks' span per keypress
+    var nextRel = Math.min(S - _WS_MIN_PANE_PX, Math.max(_WS_MIN_PANE_PX, curRel + (forward ? stepPx : -stepPx)));
+    arr[a] = sum * (nextRel / S);
+    arr[b] = sum - arr[a];
+    _wsApplyGrid(tab);
+    // Reposition this handle in place (like a live drag) rather than calling
+    // _wsLayoutResizers — that rebuilds every handle from scratch and would
+    // destroy (and unfocus) the one the user is actively adjusting.
+    if (dir === 'v') h.style.left = (startPx + nextRel - gr2.left) + 'px';
+    else h.style.top = (startPx + nextRel - gr2.top) + 'px';
+    _wsThrottleRefit(tab);
+    _wsSaveSession();
+  });
   grid.appendChild(h);
   h.addEventListener('pointerdown', function (e) {
     e.preventDefault();
@@ -2294,7 +2335,7 @@ async function renderWorkspace(container) {
           '<button class="toolbar-btn ws-icon-btn" title="Terminal settings — font, theme, cursor" aria-label="Terminal settings" onclick="toggleTerminalSettings(event)">' + _WS_ICON_GEAR + '</button>' +
           '<button class="toolbar-btn" title="Manage saved start commands" onclick="openWorkspaceCommands()">Commands</button>' +
           '<button class="toolbar-btn" title="Save the current tabs, panes and commands as a reusable layout" onclick="saveWorkspaceLayout()">Save</button>' +
-          '<select class="ws-pane-launch" id="wsLayoutsMenu" title="Launch a saved workspace layout" ' +
+          '<select class="ws-pane-launch" id="wsLayoutsMenu" title="Launch a saved workspace layout" aria-label="Launch a saved workspace layout" ' +
             'onchange="onWorkspaceLayoutsMenu(this.value); this.selectedIndex=0;"><option value="">Layouts ▾</option></select>' +
         '</div>' +
       '</div>' +