fix(mosstank): drop tooltips from the Advanced Options popup

Owner's third live look (2026-09-07): "Also still have tooltips in the
advanced options, remove please." VTank's own AdvancedOptionsView has
no tooltip mechanism at all (docs/research/vtank-kb/08-ui-views.md
§1) — its own description readout (AdvancedOptionDescription, the
label under the field) is the retail in-popup info channel, not a
hover tooltip. Removes the three tooltip= attributes
mosstank-advanced.xml had grown (the option list, the category
checklist, the value field); nothing else in the file set one.

New test AdvancedOptionsPopupHasNoElementWithATooltip builds the real
mosstank-advanced.xml against a real MossTankPanel and walks the
WHOLE resolved UiElement tree checking RuntimeTooltipTextSource is
null everywhere, rather than re-checking the three known offenders —
MarkupDocument.Build only ever sets that field when the source element
declared a real tooltip= attribute, so a null source function means no
tooltip was ever bound. Shown to fail first against a targeted
mutation (a tooltip= temporarily reintroduced on the option list) —
failed with "UiMarkupList carries a tooltip" — then reverted and
restored green.

App markup/plugin filter: 261 -> 262 (one new Fact).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/AcDream.Plugins.MossTank/mosstank-advanced.xml

@@ -167,12 +167,19 @@
   AddRouteCheckpoint/AddRouteJump themselves) — nothing was deleted from
   the plugin, only the second, redundant UI surface for it. Panel height
   shrinks 450->300 to match VTank's real 392x300 AdvancedOptionsView
-  footprint (minh follows); minw stays 392. -->
+  footprint (minh follows); minw stays 392.
+
+  Owner's third live look (2026-09-07): "Also still have tooltips in the
+  advanced options, remove please." VTank's own AdvancedOptionsView has no
+  tooltip mechanism at all — its own description readout
+  (AdvancedOptionDescription, the label at the bottom) is the retail
+  in-popup info channel, not a hover tooltip. The three tooltip= attributes
+  this popup had grown (the option list, the category checklist, the value
+  field) are removed; nothing else in this file ever set one. -->
 <panel x="253" y="405" w="392" h="300" title="MossTank Advanced Options"
        visible="{AdvancedOptionsVisible}" resizable="true" minw="392" minh="300">
   <list x="4" y="4" w="256" h="160" rowheight="17" anchor="left top right"
-        selected="{SelectedAdvancedOptionIndex}" onchange="{SelectAdvancedOption}"
-        tooltip="Select one of Virindi Tank's 137 advanced options.">
+        selected="{SelectedAdvancedOptionIndex}" onchange="{SelectAdvancedOption}">
     <column type="text" width="187" items="{AdvancedOptionNames}" onclick="{SelectAdvancedOption}" />
     <column type="text" width="69" items="{AdvancedOptionValueColumn}" onclick="{ClickAdvancedOptionValue}" />
   </list>
@@ -181,15 +188,13 @@
        pure checklist with no real selection concept — see
        SelectedAdvancedOptionCategoryIndex's own doc comment. -->
   <list x="268" y="4" w="120" h="180" rowheight="18" anchor="right"
-        selected="{SelectedAdvancedOptionCategoryIndex}"
-        tooltip="Uncheck a category to hide its settings from the list on the left.">
+        selected="{SelectedAdvancedOptionCategoryIndex}">
     <column type="check" width="20" values="{AdvancedOptionCategoryEnabled}" onchange="{ToggleAdvancedOptionCategoryAt}" />
     <column type="text" width="*" items="{AdvancedOptionCategoryNames}" onclick="{ToggleAdvancedOptionCategoryAt}" />
   </list>
   <field x="4" y="168" w="260" h="16" text="{AdvancedOptionValueDraft}"
          onchange="{SetAdvancedOptionValueDraft}" onsubmit="{SubmitAdvancedOption}"
-         maxlength="160" clearonsubmit="false" background="#E6000000"
-         tooltip="Edit the selected advanced-option value and press Enter to apply." />
+         maxlength="160" clearonsubmit="false" background="#E6000000" />
   <label x="4" y="188" w="384" h="80" text="{AdvancedOptionDescription}" color="#FFE8DEC3"
          anchor="left top right" />
 </panel>

tests/AcDream.App.Tests/UI/MossTankMarkupBuildOverRealFilesTests.cs

@@ -184,6 +184,43 @@ public sealed class MossTankMarkupBuildOverRealFilesTests
             + $"the repositioned category list (left edge {categoryList.Left}).");
     }
 
+    /// <summary>
+    /// Owner's third live look (2026-09-07): "Also still have tooltips in
+    /// the advanced options, remove please." VTank's own AdvancedOptionsView
+    /// has no tooltip mechanism at all — its description readout is the
+    /// retail in-popup info channel, not a hover tooltip. Builds the real
+    /// mosstank-advanced.xml against a real panel (the same shape every
+    /// other test in this file uses) and walks the WHOLE resolved tree —
+    /// not just the three elements that used to carry tooltip= — so a
+    /// tooltip added anywhere else in this popup in the future fails this
+    /// pin too. <see cref="MarkupDocument.Build"/> only ever sets
+    /// <see cref="UiElement.RuntimeTooltipTextSource"/> when the source
+    /// element declared a real tooltip= attribute (MarkupDocument.cs's own
+    /// ApplyCommonAttributes), so a null source function here means no
+    /// tooltip was ever bound for that element.
+    /// </summary>
+    [Fact]
+    public void AdvancedOptionsPopupHasNoElementWithATooltip()
+    {
+        string xml = File.ReadAllText(
+            Path.Combine(MossTankMarkupDirectory, "mosstank-advanced.xml"));
+        var panel = new MossTankPanel(new StubHost());
+
+        UiNineSlicePanel built = MarkupDocument.Build(xml, panel, static id => (id, 32, 32));
+
+        AssertNoElementHasATooltip(built);
+    }
+
+    private static void AssertNoElementHasATooltip(UiElement element)
+    {
+        Assert.True(
+            element.RuntimeTooltipTextSource is null,
+            $"{element.GetType().Name} carries a tooltip — the Advanced "
+            + "Options popup must have none (owner's third live look).");
+        foreach (UiElement child in element.Children)
+            AssertNoElementHasATooltip(child);
+    }
+
     /// <summary>
     /// D-6 (round E architecture re-check): every real-file re-layout pin
     /// so far only inspects ONE named element after a resize (the