feat: signing order (#1290)

Adds the ability to specify an optional signing order for documents.
When specified a document will be considered sequential with recipients
only being allowed to sign in the order that they were specified in.

.cursorrules

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+Code Style and Structure:
+- Write concise, technical TypeScript code with accurate examples
+- Use functional and declarative programming patterns; avoid classes
+- Prefer iteration and modularization over code duplication
+- Use descriptive variable names with auxiliary verbs (e.g., isLoading, hasError)
+- Structure files: exported component, subcomponents, helpers, static content, types
+
+Naming Conventions:
+- Use lowercase with dashes for directories (e.g., components/auth-wizard)
+- Favor named exports for components
+
+TypeScript Usage:
+- Use TypeScript for all code; prefer interfaces over types
+- Avoid enums; use maps instead
+- Use functional components with TypeScript interfaces
+
+Syntax and Formatting:
+- Use the "function" keyword for pure functions
+- Avoid unnecessary curly braces in conditionals; use concise syntax for simple statements
+- Use declarative JSX
+
+Error Handling and Validation:
+- Prioritize error handling: handle errors and edge cases early
+- Use early returns and guard clauses
+- Implement proper error logging and user-friendly messages
+- Use Zod for form validation
+- Model expected errors as return values in Server Actions
+- Use error boundaries for unexpected errors
+
+UI and Styling:
+- Use Shadcn UI, Radix, and Tailwind Aria for components and styling
+- Implement responsive design with Tailwind CSS; use a mobile-first approach
+
+Performance Optimization:
+- Minimize 'use client', 'useEffect', and 'setState'; favor React Server Components (RSC)
+- Wrap client components in Suspense with fallback
+- Use dynamic loading for non-critical components
+- Optimize images: use WebP format, include size data, implement lazy loading
+
+Key Conventions:
+- Use 'nuqs' for URL search parameter state management
+- Optimize Web Vitals (LCP, CLS, FID)
+- Limit 'use client':
+  - Favor server components and Next.js SSR
+  - Use only for Web API access in small components
+  - Avoid for data fetching or state management
+
+Follow Next.js docs for Data Fetching, Rendering, and Routing