shell themes: bring chip_height and dot_widths up to the approved reference

breadbar had to hardcode past these: the manifests carried pre-review values
(chip_height 32/20/36, dot_widths [6,10,14,18]) that disagreed with what the
bar actually draws, so a chrome pass overrode them locally rather than let the
manifest dictate wrong geometry.

Updated to what the user approved on the interactive reference in
bos-ui-demos/proposed/: one chip highlight height per bar (26 island, 22 flush,
22 capsule) and Option-B dot widths [8,13,17,22]. Two tests pinned the old
numbers and are updated with the reason.

A manifest that states one thing while the app draws another is the defect
class this project has hit repeatedly; the local hardcodes in breadbar can now
be removed in favour of these.

bread-theme/assets/shell/liquid-motion/theme.toml

@@ -55,7 +55,7 @@ accent_from    = "accent"
 accent_to      = "teal"
 # Not in the plan's §4 schema list, but breadbar::CHIP_HEIGHT / ::ICON_PX
 # today.
-chip_height    = 32
+chip_height    = 26
 icon_px        = 24
 
 [bar.window]