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-editor-title-input.tsx

@@ -0,0 +1,85 @@
+import { useEffect, useRef, useState } from 'react';
+
+import { ZDocumentTitleSchema } from '@documenso/trpc/server/document-router/schema';
+import { cn } from '@documenso/ui/lib/utils';
+
+export type EnvelopeItemTitleInputProps = {
+  value: string;
+  onChange: (value: string) => void;
+  className?: string;
+  placeholder?: string;
+  disabled?: boolean;
+};
+
+export const EnvelopeItemTitleInput = ({
+  value,
+  onChange,
+  className,
+  placeholder,
+  disabled,
+}: EnvelopeItemTitleInputProps) => {
+  const [envelopeItemTitle, setEnvelopeItemTitle] = useState(value);
+  const [isError, setIsError] = useState(false);
+
+  const [inputWidth, setInputWidth] = useState(200);
+  const inputRef = useRef<HTMLInputElement>(null);
+  const measureRef = useRef<HTMLSpanElement>(null);
+
+  // Update input width based on content
+  useEffect(() => {
+    if (measureRef.current) {
+      const width = measureRef.current.offsetWidth;
+      setInputWidth(Math.max(width + 16, 100)); // Add padding and minimum width
+    }
+  }, [envelopeItemTitle]);
+
+  const handleTitleChange = (title: string) => {
+    if (title === '') {
+      setIsError(true);
+    }
+
+    setEnvelopeItemTitle(title);
+
+    const parsedTitle = ZDocumentTitleSchema.safeParse(title);
+
+    if (!parsedTitle.success) {
+      setIsError(true);
+      return;
+    }
+
+    setIsError(false);
+
+    onChange(parsedTitle.data);
+  };
+
+  return (
+    <div className="relative">
+      {/* Hidden span to measure text width */}
+      <span
+        ref={measureRef}
+        className="pointer-events-none absolute left-0 top-0 whitespace-nowrap text-sm font-medium text-gray-600 opacity-0"
+        style={{ font: 'inherit' }}
+      >
+        {envelopeItemTitle || placeholder}
+      </span>
+      <input
+        data-1p-ignore
+        autoComplete="off"
+        ref={inputRef}
+        type="text"
+        value={envelopeItemTitle}
+        onChange={(e) => handleTitleChange(e.target.value)}
+        disabled={disabled}
+        style={{ width: `${inputWidth}px` }}
+        className={cn(
+          'text-foreground hover:outline-muted-foreground focus:outline-muted-foreground rounded-sm border-0 bg-transparent p-1 text-sm font-medium outline-none hover:outline hover:outline-1 focus:outline focus:outline-1',
+          className,
+          {
+            'outline-red-500': isError,
+          },
+        )}
+        placeholder={placeholder}
+      />
+    </div>
+  );
+};