PC Detail: flow Details cards, drop the IP Configuration card

Details tab card layout
-----------------------
The Details tab sat on .content-grid, a two-column CSS grid. Grid packs
items into implicit rows, so every row is as tall as its tallest card and
align-items:start leaves the shorter one with dead space beneath it:
Warranty is short, Endpoint Status is tall, and Policy had to wait for the
taller of the two rather than sliding up. That read as a staggered layout.

Switched that one tab to multicol via a .details-flow modifier, which has no
rows at all - each card starts where the previous one ended, so the holes
close while cards still size to their content.

Multicol is deliberately NOT applied to .content-grid globally. The note by
that rule in style.css records why it was abandoned there: a column-span:all
child (.pap-span, used by table panels) overlaps the shorter column when the
two are unequal. That cannot happen on this tab - every panel in the details
group is a keyvalue or list render, and spansFullWidth() only returns true
for table (or a tabs panel holding one), so nothing in the subtree spans.
Monitors and Service/Process DO carry table panels and stay on grid.

The modifier is scoped to PCDetail, so the nine other detail views on
.content-grid are untouched.

Chosen over JS masonry on purpose. Masonry packs perfectly but has to
measure every card and re-measure on resize, on panel collapse and on every
async panel load - and these panels fetch after paint, so it would mean
continuous forced reflow on a page that already polls. This is pure CSS:
no measurement, no observer, no runtime cost. The tradeoff accepted is that
column bottoms can end at slightly different heights.

Cards carry break-inside: avoid so none fragments across the column break,
and the 25px spacing returns as a margin because multicol has no gap between
stacked items the way grid does.

IP Configuration card
---------------------
Removed: the data has no purpose on the page anymore. Taken out at the root
rather than hidden - the panel declaration, the /asset/<id>/ipconfig route
and the _IPCONFIG_COLUMNS constant all go, since a route with no consumer is
dead surface that still answers requests.

test_the_two_cards_do_not_duplicate_columns_beyond_the_address existed only
to police the history/config column split; with one card gone it guards
nothing, so it and its import go with it. The panel-count assertion in
test_endpoints_asset_panels_are_computer_scoped moves 15 -> 14, which is the
test doing its job and catching the removal.

IP History is unchanged and still carries the address list.

Not addressed here: three tzset() tests in test_endpoints_plugin.py fail on
Windows because time.tzset() is Unix-only. Verified pre-existing against
unmodified code; they pass in the Linux container.

.github/copilot-instructions.md

@@ -7,6 +7,8 @@ by CI (`.github/workflows/ci.yml`) - suggestions that break them fail the build.
 ## General Guidelines
 - Finish the in-flight task before starting new workstreams.
 - When asked to "take notes" on a future idea, capture it in the notes file only - do not implement it, and do not expand on it at length in replies.
+- Use a temp file for multi-line git commit messages instead of heredoc syntax: `git commit -F <file>`.
+- Avoid using `powershell.exe -File` for launching scripts, as it fails if the script file is missing or quarantined.
 
 ## Naming (LOCKED - the hook rejects violations)