etiquette

Tags on photos can now have timestamps, so that if you are tagging
a video or audio you can reference a specific moment with your tag.
In the interface, this means the tag is clickable and seeks to that
point in the media.

For the user interface, I am finding I need to move away from jinja
for the object cards because it is too much hassle to keep the code
for jinja-based cards for static rendering and the js-based cards
for dynamic rendering in sync. Rather than write the same cards in
two languages I can dump the JSON into the script and render the cards
on load. Which makes the static HTML worse but that's what the JSON
API is for anyway.