Cmdpal extension: Powertoys extension for cmdpal (#44006)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request

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## 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

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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

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## Validation Steps Performed
Installer built, and every command works as expected,
Now use sparse app deployment, so we don't need an extra msix

---------

Co-authored-by: kaitao-ms <kaitao1105@gmail.com>

src/modules/MouseUtils/FindMyMouse/dllmain.cpp

@@ -8,6 +8,8 @@
 #include <common/utils/logger_helper.h>
 #include <common/utils/color.h>
 #include <common/utils/string_utils.h>
+#include <common/utils/EventWaiter.h>
+#include <common/interop/shared_constants.h>
 
 namespace
 {
@@ -69,6 +71,9 @@ private:
     // Find My Mouse specific settings
     FindMyMouseSettings m_findMyMouseSettings;
 
+    // Event-driven trigger support
+    EventWaiter m_triggerEventWaiter;
+
     // Load initial settings from the persisted values.
     void init_settings();
 
@@ -86,6 +91,8 @@ public:
     // Destroy the powertoy and free memory
     virtual void destroy() override
     {
+        // Ensure threads/handles are cleaned up before destruction
+        disable();
         delete this;
     }
 
@@ -150,6 +157,11 @@ public:
         m_enabled = true;
         Trace::EnableFindMyMouse(true);
         std::thread([=]() { FindMyMouseMain(m_hModule, m_findMyMouseSettings); }).detach();
+
+        // Start listening for external trigger event so we can invoke the same logic as the hotkey.
+        m_triggerEventWaiter.start(CommonSharedConstants::FIND_MY_MOUSE_TRIGGER_EVENT, [this](DWORD) {
+            OnHotkeyEx();
+        });
     }
 
     // Disable the powertoy
@@ -158,6 +170,8 @@ public:
         m_enabled = false;
         Trace::EnableFindMyMouse(false);
         FindMyMouseDisable();
+
+        m_triggerEventWaiter.stop();
     }
 
     // Returns if the powertoys is enabled
@@ -216,7 +230,7 @@ inline static uint8_t LegacyOpacityToAlpha(int overlayOpacityPercent)
         overlayOpacityPercent = 100;
     }
 
-    // Round to nearest integer (0<EFBFBD>255)
+    // Round to nearest integer (0–255)
     return static_cast<uint8_t>((overlayOpacityPercent * 255 + 50) / 100);
 }
 
@@ -532,4 +546,4 @@ void FindMyMouse::parse_settings(PowerToysSettings::PowerToyValues& settings)
 extern "C" __declspec(dllexport) PowertoyModuleIface* __cdecl powertoy_create()
 {
     return new FindMyMouse();
-}
+}