feat: add envelopes (#2025)

This PR is handles the changes required to support envelopes. The new
envelope editor/signing page will be hidden during release.

The core changes here is to migrate the documents and templates model to
a centralized envelopes model.

Even though Documents and Templates are removed, from the user
perspective they will still exist as we remap envelopes to documents and
templates.

apps/remix/app/components/general/envelope-editor/envelope-file-selector.tsx

@@ -0,0 +1,87 @@
+import { Plural } from '@lingui/react/macro';
+
+import { useCurrentEnvelopeRender } from '@documenso/lib/client-only/providers/envelope-render-provider';
+import { cn } from '@documenso/ui/lib/utils';
+
+type EnvelopeItemSelectorProps = {
+  number: number;
+  primaryText: React.ReactNode;
+  secondaryText: React.ReactNode;
+  isSelected: boolean;
+  buttonProps: React.ButtonHTMLAttributes<HTMLButtonElement>;
+};
+
+export const EnvelopeItemSelector = ({
+  number,
+  primaryText,
+  secondaryText,
+  isSelected,
+  buttonProps,
+}: EnvelopeItemSelectorProps) => {
+  return (
+    <button
+      className={`flex min-w-0 cursor-pointer items-center space-x-3 rounded-lg border px-4 py-3 transition-colors ${
+        isSelected
+          ? 'border-blue-200 bg-blue-50 text-blue-900'
+          : 'border-gray-200 bg-gray-50 hover:bg-gray-100'
+      }`}
+      {...buttonProps}
+    >
+      <div
+        className={`flex h-6 w-6 items-center justify-center rounded-full text-xs font-medium ${
+          isSelected ? 'bg-blue-100 text-blue-600' : 'bg-gray-200 text-gray-600'
+        }`}
+      >
+        {number}
+      </div>
+      <div className="min-w-0 text-left">
+        <div className="truncate text-sm font-medium">{primaryText}</div>
+        <div className="text-xs text-gray-500">{secondaryText}</div>
+      </div>
+      <div
+        className={cn('h-2 w-2 rounded-full', {
+          'bg-blue-500': isSelected,
+        })}
+      ></div>
+    </button>
+  );
+};
+
+type EnvelopeRendererFileSelectorProps = {
+  fields: { envelopeItemId: string }[];
+  className?: string;
+  secondaryOverride?: React.ReactNode;
+};
+
+export const EnvelopeRendererFileSelector = ({
+  fields,
+  className,
+  secondaryOverride,
+}: EnvelopeRendererFileSelectorProps) => {
+  const { envelopeItems, currentEnvelopeItem, setCurrentEnvelopeItem } = useCurrentEnvelopeRender();
+
+  return (
+    <div className={cn('flex h-fit space-x-2 overflow-x-auto p-4', className)}>
+      {envelopeItems.map((doc, i) => (
+        <EnvelopeItemSelector
+          key={doc.id}
+          number={i + 1}
+          primaryText={doc.title}
+          secondaryText={
+            secondaryOverride ?? (
+              <Plural
+                one="1 Field"
+                other="# Fields"
+                value={fields.filter((field) => field.envelopeItemId === doc.id).length}
+              />
+            )
+          }
+          isSelected={currentEnvelopeItem?.id === doc.id}
+          buttonProps={{
+            onClick: () => setCurrentEnvelopeItem(doc.id),
+          }}
+        />
+      ))}
+    </div>
+  );
+};