Implement drag-to-seek

[dhruvkb]

Fixes

Fixes #142 by @sarayourfriend

Description

This PR

• implements drag-to-seek functionality
• switches to composition API to better organise the code
• some minor cleanups, renames and refactors

Technical details

Vue i18n seems to not work very well with the composition API so usages of t in the <script> sections requires using the old options API syntax.

Tests

Screenshots

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[zackkrida]

these are welcome refactors along with the dragging functionality. great!

[sarayourfriend]

Tested locally and it works great! Super awesome work! 🤩