Like/boost through keybind affects many posts

**Describe the bug**
When you hit your keys `l`or `B` in order to like or boost a toot, a bunch of other toots get liked or boosted, instead of just the one selected. This happens in dev.phanpy.social but not in phanpy.social, and it started happening some days ago.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'dev.phanpy.social'
2. Select a post using `j`/`k`
3. Hit your `l` key or your `B` key.
4. See notifications pile up, informing you that so many posts were liked/boosted.

**Expected behavior**
Both `l` and `B` should affect only one toot.

**Desktop (please complete the following information):**
- OS: Debian
- Browser: happens both in Firefox and in Qutebrowser (chromium-based)
- Version: Firefox 129.0.2; Qutebrowser v3.2.1

Reproduce the issue at dev.phanpy.social with the j/k selection and l or B keybinds, then trace the keyboard handlers and post selection flow. Done means each keypress likes or boosts only the selected toot, without notifications for other posts.

Written by the indexing model from the issue text.