Overhaul School Vocabulary Manager

[michaelchadwick]

Fixes ilios/ilios#6927

The current School Vocabulary Manager needed an overhaul and that's what this PR does.

• Change the view of terms to use the same tree-style view as the TaxonomyManager used when adding terms to Courses, Sessions, etc.
• Top-level terms are still added using the conventional form but it is now hidden behind a toggle
• Move the forms for adding and editing terms into the list item
• Added Ilios-standard deletion trash can and confirmation protection
• Could not find a better icon to indicate "add sub-term", so + will have to do for now
• Full suite of integration tests
• Claude helped with the initial push to get stuff going, but plenty of manual changes were done by this human, and most code was probably updated or expanded since then

The Taxonomy Manager could probably use some updates, like adding term counts, but that's a separate PR.

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[saschaben]

I'm liking the progress! Two quick notes after a cursory review:

First - can we get a "add new (top-level) term" tooltip for the big add (+) icon, similar to what we have for the individual sub-term add icons?
second - while we are on sub-terms...what if we were to move the add sub-term function to the edit screen of the term itself? I know we touched on top-level accessibility for this, but in this iteration I think it is clear that having the full display, along with the one-level edit tool, AND right next to it the add a sub-level tool, gets a bit busy and unintuitive. Moving the sub-term add into the term edit screen might make more intuitive sense now.

[michaelchadwick]

Todo:

• Remove "Title:"
• Add tooltip to top-level term +
• Move filter to right-side, make smaller
• Clicking the highlighted row will trigger edit form
• Hide new sub term icon unless in the edit form to de-emphasize it
• Try making icons larger when in edit form mode