Sign up improvements

✨ New Features

• Redesigned sign-up and sign-in as modal dialogs with real-time validation and password manager support.

🔧 Improvements

• Improved edit summaries with clearer guidance and proactive next steps.
• Improved legal playbooks with expanded US NDA guidance and better compliance checklists.
• Improved landing page to show user avatars and badges when signed in.
• Improved template navigation with updated sidebar iconography.
• Improved file handling so new files appear instantly in Recent files.
• Improved document editing flexibility by removing length limits and expanding table support.
• Improved knowledge base content for eSign and legal workflows.****
• ****Fixed eSign file handling and related file management issues.