feat(homepage): rebuild the theme on canonical Australis tokens

The predecessor theme was ugly for two structural reasons, not one.

It did not use the design system's colours. It built a parallel OKLCH
palette "derived from the Australis philosophy" and swapped the canonical
typeface for Supreme -- a fork, not a theme. Every hex here is now copied
verbatim from ~/.claude/skills/australis-design/colors_and_type.css, and
build.py re-checks all 19 against that file at build time and warns on
drift so it cannot quietly fork again. Type is the canonical stack: Space
Grotesk / Inter / JetBrains Mono, vendored as latin-subset VARIABLE woff2
(one file per family, 102 KB total against 56 KB for three static Supreme
cuts, and no Google Fonts request at page load).

It also carried a generated full-bleed aurora image behind the entire
dashboard. Canon forbids exactly that -- "solid fills only on chrome, no
full-bleed photography, no decorative gradients", and the aurora motif
"never as a background fill behind text". The predecessor knew, said so in
its own header, and dialled the opacity down rather than dropping it. The
image is gone; the aurora survives as a 1px accent edge under the tab bar,
which is where canon sanctions it. The asset stays in images/ in case it
is ever revisited.

Direction is instrument panel. Group headings become the Australis mono
eyebrow with a hairline to the right edge -- canon calls the eyebrow a
system signature, and it turns the groups into register bands instead of
headings floating over a grid. Status stops shouting: the filled emerald
chips read louder than the service names they annotated, so they are now a
semantic dot plus a mono micro-label at tertiary contrast. Cards are
bordered and opaque, per canon's border-over-shadow rule for chrome.

Alignment, per operator feedback that pills and cards did not line up:

- The status cluster is centred on the service name's line rather than
  parked in the card's top-right corner, where Homepage's `absolute top-0`
  left it floating ~7px above the title's optical centre. The offsets
  reconstruct the title line box and are documented as moving together.
- Descriptions get a two-line minimum, so the common one-line/two-line mix
  bottom-aligns across a row. This is what made the grid look ragged.
  useEqualHeights stays false: it inflated short cards to match a widget
  card twice their height, which was the worse failure.
- The status dot is flex-centred rather than nudged with vertical-align,
  so it stays centred if the type scale changes.

Retires the Skyfall sources and the Supreme faces; theme/ now has one
source of truth.

stacks/homepage/conf/settings.yaml

@@ -3,31 +3,26 @@
 title: ... all my base ...
 theme: dark
 # `color:` only accepts Homepage's built-in Tailwind ramps, and none of them is
-# the Skyfall Sea ramp. slate is the nearest cool neutral and acts as the base
-# under conf/custom.css, which is where the real palette lives.
+# the Australis Sea ramp. slate is the nearest cool neutral and acts as the
+# base under conf/custom.css, which is where the real palette lives.
 color: slate
 
-# Background — generated locally, not stock art. Arbo (irv-ml1:8201) rendered
-# it from the `t2i-ui-background` workflow: abstract full-bleed, no subject,
-# aurora blue->cyan->green on near-black, which is the one decorative motif
-# Australis Skyfall permits and its "cool temperature always" imagery rule.
-# Job 13f0891f4e42, seed 26, flux2-klein-9b, 2048x1152.
+# NO `background:` BLOCK — DELIBERATE, DO NOT RE-ADD WITHOUT ASKING.
 #
-# Served from /app/public/images via the read-only mount in compose.yaml —
-# NOT from the config dir, which Homepage will not serve static files out of.
+# This carried a generated full-bleed aurora image (Arbo job 13f0891f4e42,
+# seed 26, flux2-klein-9b) at opacity 30. It went in on an explicit request
+# for an Arbo-generated background and came out on 2026-08-19 when the
+# operator called the result ugly.
 #
-# ⚠️ opacity is the load-bearing number, not decoration. Skyfall's rule is that
-# the aurora motif never sits behind body text; this dashboard breaks that on
-# purpose, so the image has to stay far enough back that card contrast never
-# suffers. The render is considerably brighter than the "mostly empty" brief,
-# which is exactly what this dials out. Raise it and the cards start fighting
-# the ribbon.
-background:
-  image: /images/skyfall-aurora.webp
-  blur: sm
-  saturate: 90
-  brightness: 90
-  opacity: 30
+# The image was also against canon on its own terms: Australis says "solid
+# fills only on chrome — no full-bleed photography, no decorative gradients",
+# and permits the aurora motif "never as a background fill behind text". A
+# whole dashboard is text. The predecessor knew and dialled the opacity down
+# instead of dropping it, which is how you end up with a quiet version of the
+# wrong thing. The asset is still in `images/` if this is ever revisited.
+#
+# The aurora now appears exactly where canon sanctions it: a 1px accent edge
+# under the tab bar, in conf/custom.css.
 headerStyle: boxedWidgets
 
 providers:
@@ -43,10 +38,13 @@ quicklaunch:
 showStats: false
 statusStyle: ""
 
-# Force all cards in a row to match the tallest card's height. Without
-# this, widget-bearing cards (Plex stats, Traefik metrics) stand taller
-# than plain link cards and the grid looks ragged.
-useEqualHeights: true
+# Cards size to their own content. This was `true` to stop widget-bearing
+# cards (Uptime Kuma's stat strip, Paperless's counts) standing taller than
+# plain link cards and leaving the grid ragged — but the cure was worse than
+# the disease: every short card in the row inflated into a hollow box to match
+# the tall one. A ragged bottom edge reads as content; a stretched empty card
+# reads as a rendering fault.
+useEqualHeights: false
 
 # Function-first layout, four-tab split:
 #   Main           - daily-use apps, media, bookmarks, monitoring