feat: excel import (#527)

* refactor: simplify excel import

* chore: add external deepmerge utility

* chore: create import map utilities

* chore: increase size limits on uploads

* style: small presentation tweaks

* feat: resolve times on excel import, refs #508

apps/client/src/features/modals/upload-modal/uploadModalContext.tsx

@@ -0,0 +1,21 @@
+import { create } from 'zustand';
+
+type UploadModalContext = {
+  file: File | null;
+  setFile: (file: File | null) => void;
+
+  progress: number;
+  setProgress: (progress: number) => void;
+
+  clear: () => void;
+};
+
+export const useUploadModalContextStore = create<UploadModalContext>((set) => ({
+  file: null,
+  setFile: (file: File | null) => set({ file }),
+
+  progress: 0,
+  setProgress: (progress: number) => set({ progress }),
+
+  clear: () => set({ file: null, progress: 0 }),
+}));