Fix release description hover jitter

[Herrtian]

Summary

• keep release descriptions truncated on hover so release rows do not change height
• add title text so full descriptions remain available without layout shifts
• extend the long description GUI test to cover hover row height

Fixes #173

Validation

• cargo check -p docs_rs_web
• cargo fmt --all --check
• git diff --check

[GuillaumeGomez]

Test looks good, however like mentioned, we cannot simply add the description like that in case it contains double quotes.

View changes since this review

[GuillaumeGomez]

Thanks!