refactor: unify card no-data face and fluid sizing

Extract card.notice so every cached card's no-data state is one fluid,
theme-consistent face instead of a copy per widget, and delete the
fixed-size card.label it replaces.

Derive weather's arc geometry from its band (pad, curve room, sun dot,
time labels) instead of fixed pixels, and cap the arc at a proportion of
the card's width rather than 240px.

Derive disks' bar-fallback height and its address type from the card's
own label scale.

Standardise the big-value factor to 1.0 across the fit_unit cards and
document the big-value colour rule and the disks headline exception.

1 files changed, 3 insertions, 1 deletions

diff --git a/dashboard.lua b/dashboard.lua
index b9316bb..95b3f79 100644
--- a/dashboard.lua
+++ b/dashboard.lua
@@ -155,7 +155,9 @@ local function draw(cr, sw, sh, colors)
       -- Name the missing widget in place, rather than leaving a blank cell.
       local r = rect_for(entry, sw, sh)
       local inner = card.card(cr, r, colors)
-      card.label(cr, inner.x, inner.y + 16, 'missing: ' .. entry.widget, colors)
+      card.font(cr, card.FONT_MONO, 16, false)
+      card.rgba(cr, colors.label)
+      card.text(cr, inner.x, inner.y + 16, ('missing: ' .. entry.widget):upper())
     end
   end
 end