[CmdPal] Visual dock tweaks (#45954)

## Summary of the Pull Request

- Changes the Dock height to 38px (from 32) to avoid item and app
clipping.
- Localization
- Removing dead code
- If the tooltip string is null or empty, the tooltip will not be shown
- Adding hyperlinks on the General and Dock pages in Settings (to be
updated to the corresponding docs via aka.ms)
- The droptarget for an empty listview is now wider, and has a
highlight-color to communicate an item can be dropped:
<img width="371" height="142" alt="image"
src="https://github.com/user-attachments/assets/6863ca5a-cdd4-450b-ab57-d03d83170cf8"
/>



<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist

- [ ] Closes: #xxx
<!-- - [ ] Closes: #yyy (add separate lines for additional resolved
issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

src/modules/cmdpal/Microsoft.CmdPal.UI/Dock/DockItemControl.xaml.cs

@@ -23,7 +23,7 @@ public sealed partial class DockItemControl : Control
     }
 
     public static readonly DependencyProperty ToolTipProperty =
-        DependencyProperty.Register(nameof(ToolTip), typeof(string), typeof(DockItemControl), new PropertyMetadata(null));
+        DependencyProperty.Register(nameof(ToolTip), typeof(string), typeof(DockItemControl), new PropertyMetadata(null, OnToolTipPropertyChanged));
 
     public string ToolTip
     {
@@ -31,6 +31,17 @@ public sealed partial class DockItemControl : Control
         set => SetValue(ToolTipProperty, value);
     }
 
+    private static void OnToolTipPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+    {
+        if (d is DockItemControl control)
+        {
+            // Collapse the tooltip when the string is null or empty so an
+            // empty tooltip bubble doesn't appear on hover.
+            var text = e.NewValue as string;
+            ToolTipService.SetToolTip(control, string.IsNullOrEmpty(text) ? null : text);
+        }
+    }
+
     public static readonly DependencyProperty TitleProperty =
         DependencyProperty.Register(nameof(Title), typeof(string), typeof(DockItemControl), new PropertyMetadata(null, OnTextPropertyChanged));