area/ui: add a Receive/transmit metrics graph

[yomete]

This adds an area chart that can then be used to visualise a throughput metrics graph

[alwaysmeticulous]

✅ Meticulous spotted 0 visual differences across 311 screens tested: view results.

Meticulous evaluated ~4 hours of user flows against your PR.

_{Expected differences? Click here. Last updated for commit 01df7a6. This comment will update as new commits are pushed.}