Issue — Pop ups for footnotes in HTML

• | Analyze current HTML footnote rendering | Bible Glyph | 2 |
• | Research Typst-compatible popup approach | Bible Glyph | 4 |
• | Implement code change | Bible Glyph | 2 |
• | Testing | Bible Glyph | 1 |
• | Modifications | Bible Glyph | 1.75 |
• | Validation | Bible Glyph | 0.5 | @Jayasankar