fix(mobile): knowledge panel tabs, autocomplete height floor, status row gap

The project knowledge panel's section sidebar becomes a horizontal pill
strip on mobile, where a half-width side column left no room for
content. The autocomplete popups get their 120px minimum height back —
browser keyboard panning could put the anchor above the measured
boundary and collapse them to nothing. The status row's 24px footer-swap
reservation now applies only to the assistant-status instance; the
accessory-only row above the composer (pending changes) takes the
normal 8px instead of floating a stray gap.

packages/ui/src/components/chat/StatusRow.tsx

@@ -313,7 +313,10 @@ export const StatusRow: React.FC<StatusRowProps> = ({
       // carries ~12px more structure BELOW its footer than this row has — so
       // the swap used to lift the line up. mb-6 (24px) reserves that space
       // under this row instead (verified: row top 636 == footer top 636).
-      className={cn("mb-6", !hasLeftAccessory && "chat-column")}
+      // The reservation belongs to the assistant-status swap only: a row that
+      // renders just an accessory (the pending-changes bar) takes the normal
+      // 8px, or it floats a stray gap above the composer.
+      className={cn(showAssistantStatus ? "mb-6" : "mb-2", !hasLeftAccessory && "chat-column")}
       style={STATUS_ROW_CONTAINER_STYLE}
     >
       {/* h-8 matches the turn footer's real row height: its h-8 action

packages/ui/src/components/chat/useMobileAutocompleteMaxHeight.ts

@@ -35,7 +35,11 @@ export const useMobileAutocompleteMaxHeight = (
             // The popup's bottom edge is its anchor (composer top) and does not
             // depend on its current height.
             const available = Math.max(0, Math.floor(el.getBoundingClientRect().bottom - boundaryTop - 8));
-            const next = available < normalMaxHeight ? available : undefined;
+            // Floor: browser keyboard panning can put the anchor above the
+            // measured boundary for a frame (or for the whole pan), which
+            // would collapse the popup to zero height. A short popup that
+            // slightly overlaps the header beats an invisible one.
+            const next = available < normalMaxHeight ? Math.max(120, available) : undefined;
             setMaxHeight((prev) => (prev === next ? prev : next));
         };
         measure();

packages/ui/src/components/session/project-context/ProjectNotesTodoPanel.tsx

@@ -135,6 +135,7 @@ export const ProjectNotesTodoPanel: React.FC<ProjectNotesTodoPanelProps> = ({
   const globalMemory = useAgentMemoryStore((state) => state.global);
   const projectMemory = useAgentMemoryStore((state) => state.project);
 
+  const isMobile = useUIStore((state) => state.isMobile);
   const storedTab = useUIStore((state) => state.projectContextTab);
   const setStoredTab = useUIStore((state) => state.setProjectContextTab);
   const requestedTab = TAB_ORDER.includes(storedTab as ProjectContextTab)
@@ -413,6 +414,42 @@ export const ProjectNotesTodoPanel: React.FC<ProjectNotesTodoPanelProps> = ({
 
       </div>
 
+      {/* Mobile: a half-width panel has no room for a side column, so the
+          sections become the same pill strip the mobile drawer's surface
+          tabs use — the active pill carries the label, the rest collapse to
+          icon and count. */}
+      {isMobile ? (
+        <nav
+          className="flex flex-shrink-0 items-center gap-1.5 overflow-x-auto px-3 pb-2"
+          aria-label={t('rightSidebar.contextNotesTodo.sections.label')}
+        >
+          {sections.map((section) => {
+            const isActive = activeTab === section.id;
+            return (
+              <button
+                key={section.id}
+                type="button"
+                onClick={() => setStoredTab(section.id)}
+                aria-current={isActive ? 'page' : undefined}
+                className={cn(
+                  'flex flex-shrink-0 items-center gap-1.5 rounded-full border px-3 py-1.5 transition-colors',
+                  'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/50',
+                  isActive
+                    ? 'border-transparent bg-interactive-active text-foreground'
+                    : 'border-[var(--interactive-border)] text-muted-foreground',
+                )}
+              >
+                <Icon name={section.icon} className="h-4 w-4 flex-shrink-0" />
+                {isActive ? (
+                  <span className="whitespace-nowrap typography-meta">{section.label}</span>
+                ) : null}
+                <span className="typography-micro text-muted-foreground">{section.count}</span>
+              </button>
+            );
+          })}
+        </nav>
+      ) : null}
+
       {/* Content first, sidebar on the right — the same order and the same
           drag-to-resize edge the files surface uses, so the two panels do not
           disagree about where navigation lives. */}
@@ -472,6 +509,7 @@ export const ProjectNotesTodoPanel: React.FC<ProjectNotesTodoPanelProps> = ({
         ) : null}
         </div>
 
+        {isMobile ? null : (
         <nav
           className="relative flex flex-shrink-0 flex-col gap-0.5 overflow-y-auto border-l border-[var(--interactive-border)] p-2"
           style={{ width: `${sidebarWidth}px` }}
@@ -514,6 +552,7 @@ export const ProjectNotesTodoPanel: React.FC<ProjectNotesTodoPanelProps> = ({
             );
           })}
         </nav>
+        )}
       </div>
 
       <TodoSendDialog