fix(table): harden queue and row interaction lifecycles

- fence column resize and queue lost-capture handlers to the active pointer

- keep staged bulk actions and RTL submenu keyboard navigation truthful

- add deterministic selection, resize, action-count, and keyboard regressions

src/components/DownloadTable.tsx

@@ -53,7 +53,8 @@ import {
 import {
   moveSelectedBlockToIndex
 } from '../utils/queueOrdering';
-import { updateDownloadSelection } from '../utils/downloadSelection';
+import { selectContextMenuTarget, updateDownloadSelection } from '../utils/downloadSelection';
+import { createColumnResizeSession } from '../utils/columnResize';
 import { clampFloatingPosition } from '../utils/floatingPosition';
 import { FloatingQueueSubmenu } from './FloatingQueueSubmenu';
 import { openPropertiesWindow } from '../propertiesBridge';
@@ -671,33 +672,27 @@ export const DownloadTable: React.FC<DownloadTableProps> = ({ filter, onSummaryC
     const startX = event.clientX;
     const startWidth = columnWidthsRef.current[index];
 
-    const handlePointerMove = (moveEvent: PointerEvent) => {
-      const nextWidth = Math.max(COLUMN_MINIMUMS[index], startWidth + moveEvent.clientX - startX);
+    const cleanup = createColumnResizeSession({
+      windowTarget: window,
+      documentTarget: document,
+      body: document.body,
+      pointerId: event.pointerId,
+      startX,
+      startWidth,
+      minWidth: COLUMN_MINIMUMS[index],
+      onWidth: nextWidth => {
       const nextWidths = columnWidthsRef.current.map((width, columnIndex) =>
         columnIndex === index ? nextWidth : width
       );
       columnWidthsRef.current = nextWidths;
       setColumnWidths(nextWidths);
-    };
-
-    const handlePointerUp = () => {
-      window.removeEventListener('pointermove', handlePointerMove);
-      window.removeEventListener('pointerup', handlePointerUp);
-      window.removeEventListener('pointercancel', handlePointerUp);
-      window.removeEventListener('blur', handlePointerUp);
-      document.removeEventListener('visibilitychange', handlePointerUp);
-      persistColumnWidths(columnWidthsRef.current);
-      document.body.classList.remove('is-column-resizing');
-      resizeCleanupRef.current = null;
-    };
-
-    resizeCleanupRef.current = handlePointerUp;
-    document.body.classList.add('is-column-resizing');
-    window.addEventListener('pointermove', handlePointerMove);
-    window.addEventListener('pointerup', handlePointerUp);
-    window.addEventListener('pointercancel', handlePointerUp);
-    window.addEventListener('blur', handlePointerUp);
-    document.addEventListener('visibilitychange', handlePointerUp);
+      },
+      onEnd: () => {
+        persistColumnWidths(columnWidthsRef.current);
+        resizeCleanupRef.current = null;
+      },
+    });
+    resizeCleanupRef.current = cleanup;
   };
 
   const clampMenuPosition = useCallback((x: number, y: number, menuWidth: number, menuHeight: number) => {
@@ -1335,7 +1330,9 @@ export const DownloadTable: React.FC<DownloadTableProps> = ({ filter, onSummaryC
         finishQueueDrag(true);
       }
     };
-    const lostPointerCapture = () => finishQueueDrag(true);
+    const lostPointerCapture = (event: Event) => {
+      if ((event as PointerEvent).pointerId === pointerId) finishQueueDrag(true);
+    };
     const cancel = () => finishQueueDrag(true);
     window.addEventListener('pointermove', pointerMove);
     window.addEventListener('pointerup', pointerUp);
@@ -1779,10 +1776,13 @@ export const DownloadTable: React.FC<DownloadTableProps> = ({ filter, onSummaryC
   }, [clearQueueClickSuppression, handleDownloadDoubleClick]);
 
   const handleContextMenu = useCallback((menu: { x: number; y: number; id: string }) => {
-    if (!selectedIdsRef.current.has(menu.id)) {
-      setSelectedIds(new Set([menu.id]));
-      setLastSelectedId(menu.id);
-    }
+    const nextSelection = selectContextMenuTarget({
+      selectedIds: selectedIdsRef.current,
+      lastSelectedId: lastSelectedIdRef.current,
+      targetId: menu.id,
+    });
+    setSelectedIds(nextSelection.selectedIds);
+    setLastSelectedId(nextSelection.lastSelectedId);
     setColumnMenu(null);
     const position = clampMenuPosition(menu.x, menu.y, 200, 300);
     setContextMenuPosition(position);

src/components/FloatingQueueSubmenu.tsx

@@ -2,7 +2,7 @@ import React, { useCallback, useLayoutEffect, useRef, useState } from 'react';
 import { createPortal } from 'react-dom';
 import { ChevronRight } from 'lucide-react';
 import type { Queue } from '../store/useDownloadStore';
-import { positionFloatingSubmenu, type FloatingSubmenuPosition } from '../utils/floatingPosition';
+import { isFloatingSubmenuCloseKey, positionFloatingSubmenu, type FloatingSubmenuPosition } from '../utils/floatingPosition';
 
 interface FloatingQueueSubmenuProps {
   label: React.ReactNode;
@@ -167,7 +167,7 @@ export const FloatingQueueSubmenu: React.FC<FloatingQueueSubmenuProps> = ({ labe
             }
           }}
           onKeyDown={event => {
-            if (event.key !== 'Escape' && event.key !== 'ArrowLeft') return;
+            if (!isFloatingSubmenuCloseKey(event.key, isRtl)) return;
             event.preventDefault();
             event.stopPropagation();
             closeMenu();

src/utils/columnResize.test.ts

@@ -0,0 +1,85 @@
+import { describe, expect, it, vi } from 'vitest';
+import { createColumnResizeSession } from './columnResize';
+
+const createEventTarget = () => {
+  const listeners = new Map<string, Set<EventListener>>();
+  const target = {
+    addEventListener: vi.fn((type: string, listener: EventListener) => {
+      const current = listeners.get(type) ?? new Set<EventListener>();
+      current.add(listener);
+      listeners.set(type, current);
+    }),
+    removeEventListener: vi.fn((type: string, listener: EventListener) => {
+      listeners.get(type)?.delete(listener);
+    }),
+  };
+  return {
+    target,
+    dispatch: (type: string, event: Partial<PointerEvent> = {}) => {
+      listeners.get(type)?.forEach(listener => listener(event as Event));
+    },
+  };
+};
+
+describe('column resize session', () => {
+  it('ignores other pointers, clamps the active pointer, and persists on completion', () => {
+    const windowTarget = createEventTarget();
+    const documentTarget = createEventTarget();
+    const classes = new Set<string>();
+    const onWidth = vi.fn();
+    const onEnd = vi.fn();
+    const classList = {
+      add: (value: string) => classes.add(value),
+      remove: (value: string) => classes.delete(value),
+    } as unknown as DOMTokenList;
+    createColumnResizeSession({
+      windowTarget: windowTarget.target,
+      documentTarget: documentTarget.target,
+      body: { classList },
+      pointerId: 7,
+      startX: 100,
+      startWidth: 220,
+      minWidth: 92,
+      onWidth,
+      onEnd,
+    });
+
+    expect(classes.has('is-column-resizing')).toBe(true);
+    windowTarget.dispatch('pointermove', { pointerId: 8, clientX: 1 });
+    expect(onWidth).not.toHaveBeenCalled();
+    windowTarget.dispatch('pointermove', { pointerId: 7, clientX: 1 });
+    expect(onWidth).toHaveBeenLastCalledWith(121);
+    windowTarget.dispatch('pointermove', { pointerId: 7, clientX: 1000 });
+    expect(onWidth).toHaveBeenLastCalledWith(1120);
+
+    windowTarget.dispatch('pointerup', { pointerId: 8 });
+    expect(classes.has('is-column-resizing')).toBe(true);
+    windowTarget.dispatch('pointerup', { pointerId: 7 });
+    expect(classes.has('is-column-resizing')).toBe(false);
+    expect(onEnd).toHaveBeenCalledTimes(1);
+  });
+
+  it('cleans up on visibility interruption and makes cleanup idempotent', () => {
+    const windowTarget = createEventTarget();
+    const documentTarget = createEventTarget();
+    const classList = {
+      add: vi.fn(),
+      remove: vi.fn(),
+    } as unknown as DOMTokenList;
+    const cleanup = createColumnResizeSession({
+      windowTarget: windowTarget.target,
+      documentTarget: documentTarget.target,
+      body: { classList },
+      pointerId: 3,
+      startX: 100,
+      startWidth: 220,
+      minWidth: 92,
+      onWidth: vi.fn(),
+    });
+
+    documentTarget.dispatch('visibilitychange');
+    expect(classList.remove).toHaveBeenCalledWith('is-column-resizing');
+    cleanup();
+    expect(classList.remove).toHaveBeenCalledTimes(1);
+  });
+});

src/utils/columnResize.ts

@@ -0,0 +1,61 @@
+type ResizeEventTarget = Pick<Window, 'addEventListener' | 'removeEventListener'>;
+type ResizeDocumentTarget = Pick<Document, 'addEventListener' | 'removeEventListener'>;
+type ResizeBody = Pick<HTMLElement, 'classList'>;
+
+/** Own the global listeners for one table-column resize gesture. */
+export const createColumnResizeSession = ({
+  windowTarget,
+  documentTarget,
+  body,
+  pointerId,
+  startX,
+  startWidth,
+  minWidth,
+  onWidth,
+  onEnd,
+}: {
+  windowTarget: ResizeEventTarget;
+  documentTarget: ResizeDocumentTarget;
+  body: ResizeBody;
+  pointerId: number;
+  startX: number;
+  startWidth: number;
+  minWidth: number;
+  onWidth: (width: number) => void;
+  onEnd?: () => void;
+}): (() => void) => {
+  let active = true;
+
+  const handlePointerMove = (event: Event) => {
+    const pointerEvent = event as PointerEvent;
+    if (!active || pointerEvent.pointerId !== pointerId) return;
+    onWidth(Math.max(minWidth, startWidth + pointerEvent.clientX - startX));
+  };
+
+  const cleanup = () => {
+    if (!active) return;
+    active = false;
+    windowTarget.removeEventListener('pointermove', handlePointerMove);
+    windowTarget.removeEventListener('pointerup', handlePointerEnd);
+    windowTarget.removeEventListener('pointercancel', handlePointerEnd);
+    windowTarget.removeEventListener('blur', handleInterrupted);
+    documentTarget.removeEventListener('visibilitychange', handleInterrupted);
+    body.classList.remove('is-column-resizing');
+    onEnd?.();
+  };
+
+  const handlePointerEnd = (event: Event) => {
+    if ((event as PointerEvent).pointerId === pointerId) cleanup();
+  };
+
+  const handleInterrupted = () => cleanup();
+
+  body.classList.add('is-column-resizing');
+  windowTarget.addEventListener('pointermove', handlePointerMove);
+  windowTarget.addEventListener('pointerup', handlePointerEnd);
+  windowTarget.addEventListener('pointercancel', handlePointerEnd);
+  windowTarget.addEventListener('blur', handleInterrupted);
+  documentTarget.addEventListener('visibilitychange', handleInterrupted);
+
+  return cleanup;
+};

src/utils/downloadActions.test.ts

@@ -72,7 +72,7 @@ describe('download action policy', () => {
       { status: 'completed' },
     ]);
 
-    expect(counts).toEqual({ pause: 3, resume: 3 });
+    expect(counts).toEqual({ pause: 3, resume: 4 });
   });
 
   it('keeps large action badges compact without changing the accessible count', () => {

src/utils/downloadActions.ts

@@ -45,8 +45,7 @@ export const countDownloadActions = (
   downloads: ReadonlyArray<{ status: DownloadStatus }>
 ): DownloadActionCounts => downloads.reduce<DownloadActionCounts>((counts, download) => {
   if (canPauseDownload(download.status)) counts.pause += 1;
-  if (download.status === 'paused'
-    || (canStartDownload(download.status) && !canPauseDownload(download.status))) {
+  if (canStartDownload(download.status)) {
     counts.resume += 1;
   }
   return counts;

src/utils/downloadSelection.test.ts

@@ -1,9 +1,23 @@
 import { describe, expect, it } from 'vitest';
-import { updateDownloadSelection } from './downloadSelection';
+import { selectContextMenuTarget, updateDownloadSelection } from './downloadSelection';
 
 const orderedIds = ['a', 'b', 'c', 'd'];
 
 describe('download selection', () => {
+  it('selects an unselected context-menu target without losing an existing selected target', () => {
+    expect(selectContextMenuTarget({
+      selectedIds: new Set(['a', 'b']),
+      lastSelectedId: 'b',
+      targetId: 'c',
+    })).toEqual({ selectedIds: new Set(['c']), lastSelectedId: 'c' });
+
+    expect(selectContextMenuTarget({
+      selectedIds: new Set(['a', 'b']),
+      lastSelectedId: 'b',
+      targetId: 'b',
+    })).toEqual({ selectedIds: new Set(['a', 'b']), lastSelectedId: 'b' });
+  });
+
   it('collapses select-all to the clicked row', () => {
     const result = updateDownloadSelection({
       orderedIds,

src/utils/downloadSelection.ts

@@ -3,6 +3,17 @@ export interface DownloadSelectionResult {
   lastSelectedId: string | null;
 }
 
+export const selectContextMenuTarget = ({
+  selectedIds,
+  lastSelectedId,
+  targetId,
+}: Pick<DownloadSelectionResult, 'selectedIds' | 'lastSelectedId'> & { targetId: string }): DownloadSelectionResult => {
+  if (selectedIds.has(targetId)) {
+    return { selectedIds: new Set(selectedIds), lastSelectedId };
+  }
+  return { selectedIds: new Set([targetId]), lastSelectedId: targetId };
+};
+
 interface DownloadSelectionOptions {
   orderedIds: readonly string[];
   selectedIds: ReadonlySet<string>;

src/utils/floatingPosition.test.ts

@@ -1,7 +1,15 @@
 import { describe, expect, it } from 'vitest';
-import { clampFloatingPosition, positionFloatingSubmenu } from './floatingPosition';
+import { clampFloatingPosition, isFloatingSubmenuCloseKey, positionFloatingSubmenu } from './floatingPosition';
 
 describe('floating surface positioning', () => {
+  it('uses the physical back arrow for submenu dismissal in each direction', () => {
+    expect(isFloatingSubmenuCloseKey('ArrowLeft', false)).toBe(true);
+    expect(isFloatingSubmenuCloseKey('ArrowRight', false)).toBe(false);
+    expect(isFloatingSubmenuCloseKey('ArrowRight', true)).toBe(true);
+    expect(isFloatingSubmenuCloseKey('ArrowLeft', true)).toBe(false);
+    expect(isFloatingSubmenuCloseKey('Escape', true)).toBe(true);
+  });
+
   it('keeps a variable-height menu inside the viewport', () => {
     expect(clampFloatingPosition(350, 580, 192, 220, 400, 640)).toEqual({
       x: 200,

src/utils/floatingPosition.ts

@@ -5,6 +5,9 @@ export interface FloatingPosition {
 
 export type FloatingSubmenuSide = 'left' | 'right';
 
+export const isFloatingSubmenuCloseKey = (key: string, isRtl: boolean): boolean =>
+  key === 'Escape' || key === (isRtl ? 'ArrowRight' : 'ArrowLeft');
+
 export interface FloatingSubmenuPosition extends FloatingPosition {
   side: FloatingSubmenuSide;
 }