fix(tui): prevent shortcut fall-through when modal dialogs are open - #30000

Keymap layers can have a priority and dispatch order should be last added first, so the reverse order of when layers were added, then by priority, so higher priority should win. The dialog layers registered via useBindings should get a high priority, default is just 1 or 0 or something, so they can take 1000. It's like a zindex basically.

Edit: I meant sort is by priority first, then newer registration first. So priority takes precedence.

Updated, thanks.

I switched this to a shared DIALOG_LAYER_PRIORITY = 1000, applied it to dialog-owned binding layers, removed the dialog.stack global-layer gates, and added a regression test for dialog priority winning over a newer default-priority binding.

@kommander just checking if there's anything else needed here now that this uses the priority-based approach.

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