[Shortcut Guide] Add Windows key hold activation options (#49661)

## Summary of the Pull Request

Adds configurable Windows-key hold activation to Shortcut Guide while
keeping the regular activation shortcut independent.

Users can choose to disable Windows-key activation, show taskbar
indicators, or open the full Shortcut Guide. Full-guide mode also
supports a configurable hold duration and optional close-on-release
behavior.

<img width="1099" height="611" alt="image"
src="https://github.com/user-attachments/assets/e0fe4c0f-3bef-43f8-a526-d22caf9e484e"
/>


## PR Checklist

- [ ] Closes: N/A
- [x] **Communication:** The UX and behavior were discussed before
implementation
- [x] **Tests:** Added/updated and all pass
- [x] **Localization:** All end-user-facing strings can be localized
- [x] **Dev docs:** Added/updated
- [ ] **New binaries:** Not applicable
- [ ] **Documentation updated:** Not applicable

## Detailed Description of the Pull Request / Additional comments

- Adds Off, taskbar-indicator, and full-guide Windows-key actions to
Settings.
- Adds a 100–5,000 ms hold-duration setting and a full-guide
close-on-release option.
- Handles left and right Windows keys and suppresses Start after an
activated hold.
- Routes Windows-key holds through a dedicated event so custom
activation shortcuts remain independent.
- Clears previous pressed-key registrations before refreshing them to
prevent duplicate long-press callbacks.
- Preserves compatibility with the existing `press_time` setting and
documents the new options.

## Validation Steps Performed

- Built the affected ARM64 Debug Settings, Runner, Shortcut Guide
module-interface, and Shortcut Guide UI projects.
- `ShortcutGuide.UnitTests`: 7/7 passed.
- Targeted Settings tests: 12/12 passed.
- Manually verified Off, taskbar-indicator, full-guide close-on-release,
and full-guide persistent modes.
- Verified configured hold thresholds, both Windows keys, Start
suppression, and regular-shortcut independence.
- Validated the final Settings XAML layout in the running Settings app.

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Muyuan Li (from Dev Box) <muyuanli@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 2b3acca3-e49b-4936-8fb9-6f669bd449db

src/modules/ShortcutGuide/ShortcutGuideModuleInterface/dllmain.cpp

@@ -167,7 +167,7 @@ public:
         }
     }
     virtual bool keep_track_of_pressed_win_key() override { return true; }
-    virtual UINT milliseconds_win_key_must_be_pressed() override { return 900; }
+    virtual UINT milliseconds_win_key_must_be_pressed() override { return m_millisecondsWinKeyPressTimeForGlobalWindowsShortcuts; }
 
 private:
     std::wstring app_name;
@@ -301,6 +301,30 @@ private:
             {
                 Logger::warn("Failed to initialize Shortcut Guide start shortcut");
             }
+
+try
+            {
+                auto propertiesObject = settingsObject.GetNamedObject(L"properties");
+                if (propertiesObject.HasKey(L"press_time"))
+                {
+                    auto jsonDurationObject = propertiesObject.GetNamedObject(L"press_time");
+                    if (jsonDurationObject.HasKey(L"value"))
+                    {
+                        auto pressTime = static_cast<UINT>(jsonDurationObject.GetNamedNumber(L"value"));
+                        if (pressTime < 100)
+                        {
+                            pressTime = 100;
+                        }
+                        else if (pressTime > 5000)
+                        {
+                            pressTime = 5000;
+                        }
+
+                        m_millisecondsWinKeyPressTimeForGlobalWindowsShortcuts = pressTime;
+                    }
+                }
+            }
+            catch (...) { /* Keep defaults */ }
         }
         else
         {