fix(windows): fixed switch menu staying open on focus loss.

[Farroness]

What

Fixes switch menu on popout chats not collapsing on focus loss.

Why

The switch menu staying open would cause clickthrough issues.

Closes #

How I tested it

1. Opened popout chat ingame.
2. Opened switch menu.
3. Clicked anywhere on the screen outside of a imgui window.
4. Verified switch menu collapses on loss of focus.

Screenshots

N/A

Backend coordination

N/A

Checklist

Gates (CI enforces all of these):

• dotnet build Aetherphone.sln -c Release is clean
• dotnet test passes (this is where localization lockstep and accent contrast are enforced)
• No em dashes anywhere: code, strings, JSON catalogs, docs
• No async void, no new LINQ outside the allowlisted files, no raw ImGuiHelpers.GlobalScale (use UiScale.Current), no hand-formatted clock text (use TimeText.Clock)

Strings:

• Every new user-visible string is a LocString in Core/Localization/L.cs plus the same key in all nine JSONs under src/Aetherphone/Localization/, in this same PR
• Any changed English text is updated in both L.cs and en.json so they do not drift

Quality:

• Verified in-game on the screens this touches, on the build variant that matters (/phone or /phonedev)
• Draw-path code allocates nothing per frame and uses the shared Windows/Components/ widgets, TextStyles, and Metrics tokens
• README updated if this changes what a user sees or types; the relevant page under docs/ still tells the truth
• Commit messages and this PR body carry no AI attribution trailers

[Farroness]

Poopy fix, gotta go back to the drawing board.