This is a followup to #2605

In that PR I made some small changes to 3 features to avoid content jumps.

You can contribute more of these changes:

• either by finding which features could benefit from faster loading, or
• by sending a PR with those changes.

Some features could just benefit from some minimal caching, others need element-ready

Here are some:

• batch-open-all ("Open all" dropdown added late)
• pr-filters ("Status" dropdown added late, also because the value isn't cached)
• clean-issue-filters
• default-branch-button
• latest-tag-button
• hide-zero-packages
• ... find more!

If you want to send PRs, please send one per feature.