[Glitch] Rewrite actions/modal and reducers/modal with typescript

Port 38c6216082 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/actions/modal.ts

@@ -0,0 +1,17 @@
+import { createAction } from '@reduxjs/toolkit';
+
+import type { MODAL_COMPONENTS } from '../features/ui/components/modal_root';
+
+export type ModalType = keyof typeof MODAL_COMPONENTS;
+
+interface OpenModalPayload {
+  modalType: ModalType;
+  modalProps: unknown;
+}
+export const openModal = createAction<OpenModalPayload>('MODAL_OPEN');
+
+interface CloseModalPayload {
+  modalType: ModalType | undefined;
+  ignoreFocus: boolean;
+}
+export const closeModal = createAction<CloseModalPayload>('MODAL_CLOSE');