Handle complex calculator results (#47506)

## Summary of the Pull Request

Return a friendly calculator error when Mages evaluates an expression to
a complex number instead of letting decimal conversion throw.

This fixes the PowerToys Run Calculator result for expressions such as
`sqrt(-1)` by detecting `System.Numerics.Complex` results before decimal
conversion and showing a localized error message instead.

Fixes #43937

## PR Checklist

- [x] Closes: #43937
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **Tests:** Added/updated and all pass
- [x] **Localization:** All end-user-facing strings can be localized
- [x] **Dev docs:** Added/updated
- [x] **New binaries:** Added on the required places
- [x] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [x] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [x] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [x] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [x] **Documentation updated:** Not required for this bug fix.

## Detailed Description of the Pull Request / Additional comments

The Calculator plugin previously passed complex results from Mages into
`Convert.ToDecimal`, which caused an exception for expressions like
`sqrt(-1)`.

This PR updates the calculator result transformation logic to detect
`System.Numerics.Complex` and return a localized user-facing error
message: `Complex numbers are not supported`.

It also updates calculator query tests to cover both direct keyword and
global query behavior.

## Validation Steps Performed

- Added unit test coverage for `=sqrt(-1)` returning `Complex numbers
are not supported`.
- Added unit test coverage for global query `sqrt(-1)` returning no
result instead of surfacing an unhandled exception.
- Ran `git diff --check`.
- Attempted local build/test with the PowerToys build scripts, but local
validation was blocked by Visual Studio/VC tooling configuration issues
unrelated to this change: `PlatformToolsetVersion` resolves to an empty
value during restore/build.

Author: MardSilva

src/modules/launcher/Plugins/Microsoft.PowerToys.Run.Plugin.Calculator.UnitTest/QueryTests.cs

@@ -37,6 +37,7 @@ public void Initialize()
         [DataRow("=2^96", "Result value was either too large or too small for a decimal number")]
         [DataRow("=+()", "Calculation result is not a valid number (NaN)")]
         [DataRow("=[10,10]", "Unsupported use of square brackets")]
+        [DataRow("=sqrt(-1)", "Complex numbers are not supported")]
         [DataRow("=5/0", "Expression contains division by zero")]
         [DataRow("=5 / 0", "Expression contains division by zero")]
         [DataRow("10+(8*9)/0+7", "Expression contains division by zero")]
@@ -63,6 +64,7 @@ public void ErrorResultOnInvalidKeywordQuery(string typedString, string expected
         [DataRow("2^96")]
         [DataRow("+()")]
         [DataRow("[10,10]")]
+        [DataRow("sqrt(-1)")]
         [DataRow("5/0")]
         [DataRow("5 / 0")]
         [DataRow("10+(8*9)/0+7")]

src/modules/launcher/Plugins/Microsoft.PowerToys.Run.Plugin.Calculator/CalculateEngine.cs

@@ -5,6 +5,7 @@
 using System;
 using System.Collections.Generic;
 using System.Globalization;
+using System.Numerics;
 using System.Text.RegularExpressions;
 
 using Mages.Core;
@@ -124,6 +125,11 @@ private static dynamic TransformResult(object result)
                 return Properties.Resources.wox_plugin_calculator_double_array_returned;
             }
 
+            if (result is Complex)
+            {
+                return Properties.Resources.wox_plugin_calculator_complex_number_returned;
+            }
+
             return result;
         }
 

src/modules/launcher/Plugins/Microsoft.PowerToys.Run.Plugin.Calculator/Properties/Resources.Designer.cs

@@ -141,6 +141,9 @@
   <data name="wox_plugin_calculator_double_array_returned" xml:space="preserve">
     <value>Unsupported use of square brackets</value>
   </data>
+  <data name="wox_plugin_calculator_complex_number_returned" xml:space="preserve">
+    <value>Complex numbers are not supported</value>
+  </data>
   <data name="wox_plugin_calculator_not_covert_to_decimal" xml:space="preserve">
     <value>Result value was either too large or too small for a decimal number</value>
   </data>
@@ -187,4 +190,4 @@
     <value>Gradians</value>
     <comment>Text for angle unit.</comment>
   </data>
-</root>
+</root>