Add button to delete all WireGuard configs

[niranjankartha]

Add a button to delete all the added WireGuard config options at once. Show a dialog box before deleting which indicates that it's irreversible (unless they still have access to the wireguard files).

This button shows up along side the "Add via QR / File / Create" buttons, so its position can be changed if necessary.

This closes #2595

[ignoramous]

If you can, will you pls post a screengrab / video of how this works?

[Copilot]

Pull request overview

Adds a “Delete All” action to the WireGuard configuration screen to help users quickly remove large imported config sets, with a confirmation dialog warning that the action is irreversible.

Changes:

• Added new “Delete All” confirmation dialog strings (including Malayalam localization entries).
• Added a new Extended FAB to the WireGuard main layout and expanded/collapsed FAB animation offsets.
• Implemented delete-all flow in WgMainActivity to delete all WireGuard configs after confirmation.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
app/src/main/res/values/strings.xml	Adds dialog title/description strings for “Delete All”.
app/src/main/res/values/dimens.xml	Adds a new dimension used for FAB expansion spacing.
app/src/main/res/values-ml/strings.xml	Adds Malayalam localized strings for the new dialog.
app/src/main/res/layout/activity_wireguard_main.xml	Adds a new “delete all” Extended FAB alongside existing action FABs.
app/src/full/java/com/celzero/bravedns/ui/activity/WgMainActivity.kt	Wires the new FAB to a confirmation dialog and performs delete-all logic + FAB expand/collapse updates.

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[niranjankartha]

Here you go, @ignoramous:

rethink-2596-screencap-compressed.mp4

There's also a toast saying "Done" that shows up after all the deletes complete but my screen recording didn't capture it.

I put the "DELETE ALL" button over there because I couldn't think of any other place to put it. Accepting suggestions on where y'all think would be appropriate.