refactor: simplify download speed menu

Expose a single Test Download Speed action backed by the multithreaded scheduler while retaining and documenting the single-threaded API for programmatic callers. Remove the obsolete translation and cover the menu label, shortcut, and dispatch behavior.

Signed-off-by: Loren Eteval <loren.eteval@proton.me>

Furious/Externals/GenTranslation.py

@@ -549,14 +549,6 @@ TRANSLATION = {
         "ZH": "测试下行速度",
         "isReviewed": "True"
     },
-    "Test Download Speed (Multithreaded)": {
-        "source": [
-            "Furious.Widget.ServerTableView"
-        ],
-        "RU": "Измерить скорость загрузки (многопоточная)",
-        "ZH": "测试下行速度（多线程）",
-        "isReviewed": "True"
-    },
     "Clear Test Results": {
         "source": [
             "Furious.Widget.ServerTableView"

Furious/Widget/ServerTableView.py

@@ -1472,22 +1472,17 @@ class ServerTableView(
                     QtCore.Qt.Key.Key_O,
                 ),
             ),
+            # The context menu intentionally exposes only the multithreaded test.
+            # Keep the single-threaded methods as a programmatic API for callers
+            # that need that scheduler explicitly.
             AppQAction(
-                _('Test Download Speed (Multithreaded)'),
+                _('Test Download Speed'),
                 callback=lambda: self.testSelectedItemDownloadSpeedMulti(),
                 shortcut=QtCore.QKeyCombination(
                     QtCore.Qt.KeyboardModifier.ControlModifier,
                     QtCore.Qt.Key.Key_M,
                 ),
             ),
-            AppQAction(
-                _('Test Download Speed'),
-                callback=lambda: self.testSelectedItemDownloadSpeed(),
-                shortcut=QtCore.QKeyCombination(
-                    QtCore.Qt.KeyboardModifier.ControlModifier,
-                    QtCore.Qt.Key.Key_T,
-                ),
-            ),
             AppQAction(
                 _('Clear Test Results'),
                 callback=lambda: self.clearSelectedItemTestResult(),
@@ -2511,7 +2506,11 @@ class ServerTableView(
         )
 
     def testSelectedItemDownloadSpeed(self):
-        """Handle test selected item download speed for the user servers Qt table view."""
+        """Run the retained single-threaded download-test API for selected rows.
+
+        The Home context menu uses the multithreaded variant; this method remains
+        available for programmatic callers that explicitly need serial scheduling.
+        """
         self.testSelectedItemDownloadSpeedWithTimeout(5000)
 
     def testSelectedItemDownloadSpeedMulti(self):

tests/test_qt_interactions.py

@@ -35,7 +35,7 @@ from Furious.Window.SettingsPage import (
 )
 from Furious.Window.SubscriptionPage import _SubscriptionEditorDialog
 
-from PySide6 import QtCore
+from PySide6 import QtCore, QtGui
 from PySide6.QtTest import QTest
 from PySide6.QtWidgets import QLineEdit, QVBoxLayout, QWidget
 
@@ -361,6 +361,48 @@ class ServerTableQtInteractionTest(unittest.TestCase):
                 window.close()
                 window.deleteLater()
 
+    def testContextMenuUsesOnlyMultithreadedDownloadSpeedAction(self):
+        """Expose one download command backed by the multithreaded scheduler."""
+        with isolatedSettings():
+            table = self._table(('one',))
+
+            try:
+                actions = tuple(
+                    action
+                    for action in table.contextMenu.actions()
+                    if not action.isSeparator()
+                    and action.textEnglish == 'Test Download Speed'
+                )
+
+                self.assertEqual(len(actions), 1)
+                self.assertEqual(
+                    actions[0].shortcut(),
+                    QtGui.QKeySequence(
+                        QtCore.QKeyCombination(
+                            QtCore.Qt.KeyboardModifier.ControlModifier,
+                            QtCore.Qt.Key.Key_M,
+                        )
+                    ),
+                )
+
+                with (
+                    mock.patch.object(
+                        table,
+                        'testSelectedItemDownloadSpeedMulti',
+                    ) as multithreaded,
+                    mock.patch.object(
+                        table,
+                        'testSelectedItemDownloadSpeed',
+                    ) as singleThreaded,
+                ):
+                    actions[0].trigger()
+                    processQtEvents()
+
+                multithreaded.assert_called_once_with()
+                singleThreaded.assert_not_called()
+            finally:
+                self._destroyTable(table)
+
     def testHeaderSortPreservesSelectionCurrentAndActiveIdentity(self):
         """Remap Qt persistent indexes when a real header click sorts rows."""
         with isolatedSettings():