Add Alt+Tab / Alt+Shift+Tab window-switching navigation actions

[bhasden]

Summary

• Adds four new NavigationAction presets under the existing "Navigation Action" mapping type, so Windows switchers can map Alt+Tab / Alt+Shift+Tab to macOS window/app switching without hand-crafting a raw key-swap rule:
  • Switch App → ⌘Tab
  • Switch Window → ⌘` (cycles windows within the frontmost app)
  • Switch App (Reverse) → ⇧⌘Tab
  • Switch Window (Reverse) → ⇧⌘` (for going back with Alt+Shift+Tab)
• Adds matching localizedName branches and translated strings for all 14 supported languages in Localization.swift, following the existing action* naming/dictionary pattern.

Test plan

• swiftc compiles cleanly (both files, arm64 target, no warnings)
• ./build.sh produces a signed universal BC64Keys.app
• Manually verified in the running app: created a Navigation Action rule with source Option+Tab → Switch App, and Option+Shift+Tab → Switch App (Reverse); both trigger the expected macOS behavior
• Maintainer review of translation strings (best-effort, not native-speaker verified)

[Copilot]

Pull request overview

This PR adds new preset NavigationActions to support Windows-style Alt+Tab / Alt+Shift+Tab window/app switching mappings, along with localized display strings so users can select these actions without creating raw key-swap rules.

Changes:

• Adds four new NavigationAction presets for app/window switching (forward and reverse) using ⌘Tab and ⌘`.
• Extends NavigationAction.localizedName to provide localized UI labels for the new actions.
• Adds new L10n entries (and translations) for the four “Switch *” action labels.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
Sources/BC64Keys/Localization.swift	Adds actionSwitchApp, actionSwitchWindow, and reverse variants with translations used by the UI.
Sources/BC64Keys/BC64KeysApp.swift	Adds new NavigationAction presets and localized-name mapping branches for the new switch actions.

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[bhasden]

@badcode64 Please let me know if you'd like this PR done differently. I tried to adhere to the CONTRIBUTING.md guidelines. I commonly switch back and forth between Windows and MacOS and your BC64Keys app has helped simplify that transition. An Alt+Tab mapping was one of the first things I ran up against that wasn't supported. I couldn't use the key swap functionality because MacOS kept taking over the Cmd+Tab target keypress. Let me know if I missed some existing functionality somewhere.

[badcode64]

Hi @bhasden — thanks for using BC64Keys, and thanks for the PR. It's well put together, I'll review it as soon as I can.

The Alt+Tab mapping is a good idea. The reason I never added it myself is that I use a separate app of mine for window switching:

BadCode64 Window Manager

It handles app switching, and also switching between multiple windows of the same app — so if you have several projects open in Cursor or VS Code, it can cycle through those too. You might find it useful alongside BC64Keys.

That said, having the presets built into BC64Keys makes sense for people who don't want a second app running, so I'm not against the change at all. I'll get back to you after I've gone through the diff.

[bhasden]

Hi @bhasden — thanks for using BC64Keys, and thanks for the PR. It's well put together, I'll review it as soon as I can.

The Alt+Tab mapping is a good idea. The reason I never added it myself is that I use a separate app of mine for window switching:

BadCode64 Window Manager

It handles app switching, and also switching between multiple windows of the same app — so if you have several projects open in Cursor or VS Code, it can cycle through those too. You might find it useful alongside BC64Keys.

That said, having the presets built into BC64Keys makes sense for people who don't want a second app running, so I'm not against the change at all. I'll get back to you after I've gone through the diff.

Well that makes sense. Thanks for the link. I'll check out the separate Window Manager app.