diff --git a/src/web/public/app.js b/src/web/public/app.js
index 2f5d4b30..ea3ccd66 100644
--- a/src/web/public/app.js
+++ b/src/web/public/app.js
@@ -1426,8 +1426,11 @@ class CodemanApp {
     // visible welcome list) on session structural changes. Extra listeners on the
     // same EventSource — EventSource supports multiple listeners per event — so the
     // existing handlers above are untouched. Registered through addListener so they
-    // are torn down with the rest on reconnect.
-    for (const event of [SSE_EVENTS.SESSION_CREATED, SSE_EVENTS.SESSION_UPDATED, SSE_EVENTS.SESSION_DELETED]) {
+    // are torn down with the rest on reconnect. Only structural events (created /
+    // deleted) trigger a refetch: session:updated is batch-broadcast every ~500ms
+    // per active session, which would otherwise turn an open modal / visible welcome
+    // list into a sustained ~1 Hz full ~/.claude/projects rescan loop.
+    for (const event of [SSE_EVENTS.SESSION_CREATED, SSE_EVENTS.SESSION_DELETED]) {
       addListener(event, () => this._onSessionListMaybeChanged());
     }
   }
diff --git a/src/web/public/index.html b/src/web/public/index.html
index 23c6c57f..bf1d34ab 100644
--- a/src/web/public/index.html
+++ b/src/web/public/index.html
@@ -118,7 +118,8 @@
         </div>
         <button class="btn-icon-header btn-redraw-terminal btn-redraw-terminal--hidden" onclick="app.restoreTerminalSize()" title="Redraw terminal to fit current screen (Ctrl+Shift+R)" aria-label="Redraw terminal"><svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><polyline points="1 4 1 10 7 10"/><polyline points="23 20 23 14 17 14"/><path d="M20.49 9A9 9 0 0 0 5.64 5.64L1 10m22 4l-4.64 4.36A9 9 0 0 1 3.51 15"/></svg></button>
         <button class="btn-icon-header btn-response-viewer-header btn-response-viewer-header--hidden" onclick="app.toggleResponseViewer()" title="View last response" aria-label="View last response"><svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"/><circle cx="12" cy="12" r="3"/></svg></button>
-        <button class="btn-icon-header btn-away-digest" onclick="app.openAwayDigest()" title="Away Digest" aria-label="Open away digest"><svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M8 6h13"/><path d="M8 12h13"/><path d="M8 18h13"/><path d="M3 6h.01"/><path d="M3 12h.01"/><path d="M3 18h.01"/></svg></button> <button class="btn-icon-header btn-session-manager" onclick="app.openSessionManager()" title="Session Manager" aria-label="Open session manager"><svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><polyline points="12 2 2 7 12 12 22 7 12 2"/><polyline points="2 17 12 22 22 17"/><polyline points="2 12 12 17 22 12"/></svg></button>
+        <button class="btn-icon-header btn-away-digest" onclick="app.openAwayDigest()" title="Away Digest" aria-label="Open away digest"><svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M8 6h13"/><path d="M8 12h13"/><path d="M8 18h13"/><path d="M3 6h.01"/><path d="M3 12h.01"/><path d="M3 18h.01"/></svg></button>
+        <button class="btn-icon-header btn-session-manager" onclick="app.openSessionManager()" title="Session Manager" aria-label="Open session manager"><svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><polyline points="12 2 2 7 12 12 22 7 12 2"/><polyline points="2 17 12 22 22 17"/><polyline points="2 12 12 17 22 12"/></svg></button>
         <button class="btn-icon-header btn-attachments-history btn-attachments-history--hidden" id="attachmentsHistoryBtn" onclick="app.toggleAttachmentHistory()" title="Attachments" aria-label="Open attachment history" aria-expanded="false">
           <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m21.44 11.05-9.19 9.19a6 6 0 0 1-8.49-8.49l9.19-9.19a4 4 0 0 1 5.66 5.66l-9.2 9.19a2 2 0 0 1-2.83-2.83l8.49-8.48"/></svg>
           <span class="attachment-history-badge" id="attachmentHistoryBadge" style="display:none;">0</span>
diff --git a/src/web/public/mobile.css b/src/web/public/mobile.css
index 95b71ded..39ab745b 100644
--- a/src/web/public/mobile.css
+++ b/src/web/public/mobile.css
@@ -459,14 +459,16 @@ html.mobile-init .file-browser-panel {
     height: 12px;
   }
 
-  /* Hide header settings gear, lifecycle log, and away digest on mobile - settings
-     moved to toolbar; away digest is a secondary informational control that doesn't
-     belong on the cramped phone header.
+  /* Hide header settings gear, lifecycle log, away digest, and session manager on
+     mobile - settings moved to toolbar; away digest and the session manager are
+     secondary controls that don't belong on the cramped phone header (the session
+     manager stays reachable via the Ctrl+K palette's "Browse all sessions" item).
      (The attachments button is opt-in / default-hidden everywhere via its own
      --hidden marker, so it needs no mobile-specific rule here.) */
   .btn-icon-header.btn-settings,
   .btn-icon-header.btn-lifecycle-log,
-  .btn-icon-header.btn-away-digest {
+  .btn-icon-header.btn-away-digest,
+  .btn-icon-header.btn-session-manager {
     display: none !important;
   }
 
diff --git a/src/web/public/terminal-ui.js b/src/web/public/terminal-ui.js
index 0684258f..53b54bfa 100644
--- a/src/web/public/terminal-ui.js
+++ b/src/web/public/terminal-ui.js
@@ -1152,8 +1152,14 @@ Object.assign(CodemanApp.prototype, {
    */
   async _fetchUnifiedSessions(limit = 60) {
     const res = await fetch('/api/sessions/unified?limit=' + limit);
-    const data = await res.json();
-    return data.data?.sessions || [];
+    // ApiResponse envelope: { success, data: { sessions } }. Throw on failure so
+    // callers (loadHistorySessions) hit their catch instead of rendering a 5xx as
+    // an empty history.
+    const data = await res.json().catch(() => null);
+    if (!res.ok || !data || data.success === false || !data.data) {
+      throw new Error(data?.error || `unified sessions request failed (HTTP ${res.status})`);
+    }
+    return data.data.sessions || [];
   },
 
   /**
@@ -1385,14 +1391,15 @@ Object.assign(CodemanApp.prototype, {
    * @param {HTMLElement} detail the inline detail panel element
    */
   _openSessionRowMenu(anchorEl, s, cases, item, detail) {
-    // Close any already-open row menu first.
-    if (this._openRowMenuEl) {
+    // Close any already-open row menu first — call its own close fn so the
+    // previous menu's document/window listeners are detached (a raw .remove()
+    // would leave them dangling until the next event self-cleans).
+    if (this._openRowMenuClose) {
       try {
-        this._openRowMenuEl.remove();
+        this._openRowMenuClose();
       } catch {
         /* noop */
       }
-      this._openRowMenuEl = null;
     }
 
     const isLiveOpen =
@@ -1416,7 +1423,10 @@ Object.assign(CodemanApp.prototype, {
       } catch {
         /* noop */
       }
-      if (this._openRowMenuEl === menu) this._openRowMenuEl = null;
+      if (this._openRowMenuEl === menu) {
+        this._openRowMenuEl = null;
+        this._openRowMenuClose = null;
+      }
     };
 
     // Helper: build one menu item button.
@@ -1451,7 +1461,9 @@ Object.assign(CodemanApp.prototype, {
         if (isLiveOpen) {
           this.selectSession(s.sessionId);
         } else {
-          this.resumeHistorySession(s.sessionId, s.workingDir || '');
+          // Resume by the Claude conversation UUID when present (resumed sessions
+          // carry theirs separately from their Codeman id).
+          this.resumeHistorySession(s.claudeSessionId || s.sessionId, s.workingDir || '');
         }
         this.closeSessionManager?.();
         closeMenu();
@@ -1521,6 +1533,7 @@ Object.assign(CodemanApp.prototype, {
     window.addEventListener('resize', onScrollResize, true);
 
     this._openRowMenuEl = menu;
+    this._openRowMenuClose = closeMenu;
   },
 
   /** Number of history items shown before "Show More" */
diff --git a/test/mobile-header-buttons-policy.test.ts b/test/mobile-header-buttons-policy.test.ts
index e060e456..ba0fd32f 100644
--- a/test/mobile-header-buttons-policy.test.ts
+++ b/test/mobile-header-buttons-policy.test.ts
@@ -38,7 +38,7 @@ const MOBILE_VISIBLE_ALLOWLIST = new Set<string>([]);
 // that removes a hide rule fails loudly (not silently). The attachments button is
 // NOT here: it's opt-in (default-hidden everywhere via its own --hidden marker), so
 // it's excluded from the default-visible enumeration rather than mobile-hidden.
-const KNOWN_PHONE_HIDDEN = ['btn-settings', 'btn-lifecycle-log'];
+const KNOWN_PHONE_HIDDEN = ['btn-settings', 'btn-lifecycle-log', 'btn-session-manager'];
 
 function attrOf(openTag: string, name: string): string {
   const m = openTag.match(new RegExp(`${name}="([^"]*)"`));