Add a switch to turn the global hotkey off

[StuartMeeks]

Summary

Adds a setting to turn the global hotkey on/off, per request. In Settings → Global hotkey there is now an Enabled checkbox next to the chord:

• Clearing it turns the hotkey off immediately (unregisters it) and disables the shortcut-capture box.
• Ticking it re-registers the stored chord immediately.
• The choice persists across restarts — no Save button; it saves on toggle.
• The Reset button now also switches the hotkey back on and restores the Ctrl+Alt+S default.
• The stored chord is retained while disabled, so re-enabling brings it back.

How it works

• New AppConfig.HotkeyEnabled (defaults to true, so existing settings files keep their hotkey — no schema bump needed since the field is purely additive and older builds simply ignore it).
• SettingsViewModel.HotkeyEnabled observable persists and registers/unregisters on change; the change handler is inert during construction (respects _suppressPersist) so opening Settings never re-registers.
• Startup (App.InitialiseHotkey) skips registration when disabled.

Incidental: unblock the build

Microsoft.Data.Sqlite 10.0.9 transitively pulls SQLitePCLRaw.lib.e_sqlite3 2.1.11, which a newly-published advisory (NU1903 / GHSA-2m69-gcr7-jv3q) now flags. With TreatWarningsAsErrors this fails restore on main too, unrelated to this change. The patched native lib is a SQLitePCLRaw 2.x→3.x major jump that Microsoft.Data.Sqlite 10.x doesn't yet bind (11.x is preview-only), so this adds a scoped, documented NuGetAuditSuppress for the advisory ID. The vuln concerns native SQLite parsing of untrusted DB files; Snipdeck only ever opens its own local history.db. Remove once Microsoft.Data.Sqlite ships a patched bundle.

Version

Bumps the minor version to 1.1.0 and promotes the changelog.

Testing

• Snipdeck.Core.Tests: 245 pass, including 5 new tests covering initial enabled state, disable→unregister+persist, enable→register+persist, enable-with-registration-failure error, and Reset re-enabling when off.
• Full solution compiles clean on the Windows head (WinUI/XAML), 0 warnings.

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