[ananthajith17]

Summary

Added JSDoc documentation to the main category, theme, and resource-rendering functions.

Related issue

None specified.

Changes made

• Documented parameters, return values, and fallback behavior for getCategoryLabel() and filterByCategory() in filters.js.
• Documented theme preferences, application, persistence, and initialization for getPreferredTheme(), applyTheme(), setTheme(), and initTheme() in theme.js.
• Documented resource data and return values for createResourceCard() and renderResources() in app.js.

Testing performed

• I ran the site locally and tested the change.
• I checked the browser console for errors.
• I tested on desktop and mobile widths.
• Other: Checked editor diagnostics for the edited JavaScript files; no errors were reported.

Screenshots

Not applicable; these changes only add documentation comments.

Contributor checklist

• My change follows the existing code style.
• I have tested my change locally.
• I have not committed unrelated files.
• I have commented my code where non-obvious logic lives.