feat: Add Modal History Navigation and Local Development Setup

[davidjeonai-web]

🚀 Overview

This PR introduces a modal history navigation (back button functionality) for multi-popup scenarios and significantly improves the local development workflow by adding a dedicated static build setup. These enhancements are strictly additive and introduce no breaking changes to existing functionality.

🛠️ Changes Made

1. Modal History & Back Functionality

• modal.js:
  • Introduced a modalHistory stack to track content states.
  • Added a historyLength getter and a goBack() method to navigate through previous states.
  • Updated logic to push current content to the stack upon opening and clear the history upon closing to prevent stale content.
• modal.stache:
  • Implemented a conditional "Back" button in the modal header (rendered when modalHistory.length > 1).
  • Included appropriate ARIA labels for accessibility and a click handler mapped to goBack().
• modal.less:
  • Added styles for the new .back button, including focus/hover states.
  • Applied Safari-specific outline fixes to ensure consistent accessibility visibility.

2. Local Development Setup

• package.json: Added a new dev script to streamline local builds and serve files locally (node scripts/build.local.js && npx http-server dist_local).
• build.viewer.html.js:
  • Refactored the build script to support local builds via a new isLocal parameter.
  • Adjusted template paths using the templatePath variable.
  • Configured the output to target index.html locally rather than the demo folder.
• README.md: Added a comprehensive "Local Development & Testing" section detailing how to place guide files, use the npm run dev command, and understand current HMR limitations.
• .gitignore: Added dist_local, index.html, and default to prevent accidental commits of local build artifacts and sample guide files.
• scripts/ Directory: Added a new directory to house local build utilities and scripts.

🧪 Impact

• UX Improvement: Users can now smoothly navigate back through previously viewed content in nested popup scenarios.
• DX Improvement: Developers can easily spin up a local server and test changes in an isolated environment without relying on the production build pipeline.