What does this PR do?

Closes #798

Adds Fluid Typography & CSS clamp() Calculator Studio (tools/fluid-typography-calculator.html) under the CSS Tools category. The tool provides a visual playground to calculate, preview, and generate CSS clamp(min, preferred, max) linear interpolation formulas for fluid typography and spacing with an interactive drag-resizable viewport simulator and modular type scale generator.

Type of Change

• New tool
• Enhancement to existing tool
• Bug fix
• Documentation update
• Build system / infrastructure

Screenshot

Checklist

• I have read the Contributing Guide
• My branch follows the naming convention (add/tool-name, feat/description, or fix/description)
• I have tested my changes locally in at least one modern browser

For new tools:

• The tool is a single self-contained .html file in the tools/ folder
• The filename is kebab-case (fluid-typography-calculator.html)
• I added an entry to data/tools.json with all required fields
• I added a screenshot as tools/fluid-typography-calculator.png next to the HTML file
• No JS frameworks or heavy UI libraries
• I ran node scripts/sort-norm.js data/tools.json to sort and normalize the tools registry
• I ran node scripts/build.js and verified the landing page renders correctly