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/upload-entry/UploadEntry.module.scss

@@ -0,0 +1,53 @@
+@use '../../../../theme/ontimeColours' as *;
+@use '../../../../theme/v2Styles' as *;
+
+.uploadedItem {
+  margin: 0 auto;
+  width: 100%;
+  max-width: 550px;
+
+  border: 1px solid $gray-200;
+  padding: 0.5rem;
+  display: grid;
+  grid-template-areas:
+          "icon     title     close"
+          "icon     info      ."
+          "progress progress  progress";
+  grid-template-columns: auto 1fr auto;
+  column-gap: 1rem;
+  border-radius: 3px;
+
+  .icon {
+    align-self: center;
+    grid-area: icon;
+    font-size: 2rem;
+    color: $gray-700;
+  }
+
+  .fileTitle {
+    grid-area: title;
+    font-size: calc(1rem - 2px);
+    color: $ui-black;
+  }
+
+  .fileInfo {
+    grid-area: info;
+    font-size: calc(1rem - 4px);
+    color: $gray-1100;
+  }
+
+  .fileProgress {
+    grid-area: progress;
+  }
+
+  .cancelUpload {
+    grid-area: close;
+    cursor: pointer;
+  }
+
+  &.error {
+    .icon {
+      color: $error-red;
+    }
+  }
+}