bread-theme: differentiate liquid-motion/glass-workbench launcher geometry per approved demos

The two built-in launcher themes previously shared the same row radius,
padding, icon treatment, and selection fill (only mode/width/top/radius/
icon_px were themed), so breadbox's overlay rendered as one launcher
recoloured rather than two different instruments.

Adds row_radius, row_inset, row_padding_v/h, icon_radius, search_font_size,
search_padding_v/h, and selection_alpha to [launcher], all consumed by
breadbox's build_css in the paired breadbox commit. Sets liquid-motion to
the soft/roomy demo numbers (row radius 12, 28px icons, 22% selection alpha,
Recent/Apps section headers) and glass-workbench to the dense/technical demo
numbers (row radius 6, 22px icons, 28% selection alpha, flat list).

Also wires up three previously-declared-but-unconsumed tokens
(font_family, font_fallback, font_size_base) for breadbox's launcher panel
specifically — scoped consumption, not the full ecosystem-wide font system
replacement (breadbar/stylesheet() are unaffected). Updated the stale
doc comments in types.rs/mod.rs and both theme.toml files to match, and
updated the two existing launcher-geometry tests plus added a glass-workbench
equivalent.

Defaults for all new keys reproduce breadbox's pre-redesign hardcoded CSS
values, so themes that don't set them (spotlight's capsule doesn't read any
of this) are unaffected.

bread-theme/assets/shell/glass-workbench/theme.toml

@@ -11,18 +11,21 @@
 # — it is new, so demo fidelity is the only source of truth. See Phase 5's
 # task notes for the two exceptions: font (IBM Plex Sans is not installed on
 # the dev machine, so this renders in fallback until the user installs
-# ttf-ibm-plex) and colour (the demo's #7a9a88 sage is a *flat* accent, so it
-# maps to the palette's `green` token for both accent_from and accent_to —
-# never a literal hex value, or pywal theming breaks).
+# ttf-ibm-plex — this now matters for real: breadbox's launcher panel
+# consumes font_family/font_fallback below, see [tokens]'s own note) and
+# colour (the demo's #7a9a88 sage is a *flat* accent, so it maps to the
+# palette's `green` token for both accent_from and accent_to — never a
+# literal hex value, or pywal theming breaks).
 
 name = "Glass Workbench"
 id   = "glass-workbench"
 
 [tokens]
-# Declared-but-not-yet-consumed: see liquid-motion/theme.toml's identical
-# note next to these three keys — neither breadbar nor breadbox reads them;
-# the font that actually renders comes from bread_theme::stylesheet()'s own
-# hardcoded constant instead.
+# font_family/font_fallback/font_size_base are consumed by breadbox's
+# launcher panel only (breadbox::main::build_css's entry.search/row rules —
+# see Tokens::font_family's doc comment for the exact scope); breadbar's
+# bar/chip/clock text still comes from bread_theme::stylesheet()'s own
+# hardcoded FONT_FAMILY constant, unaffected by this key.
 font_family    = "IBM Plex Sans"
 font_fallback  = "Inter, Noto Sans, sans-serif"
 font_size_base = 13
@@ -91,21 +94,34 @@ format    = "%H:%M"
 show_date = true
 
 [launcher]
+# Glass Workbench — dense and technical, the deliberate opposite of Liquid
+# Motion's soft/roomy numbers: a tight panel radius, snug row insets/padding,
+# small 22px icons, a flat (no section headers) list, and a denser accent
+# selection fill. Spec: bos-ui-demos/proposed/glass-workbench.html's `.bx`
+# block. breadbox reads every key below now; see main.rs's build_css.
 mode     = "overlay"
 width    = 560
 top      = "64px"
-radius   = 12
-icon_px  = 32
+radius   = 10
+icon_px  = 22
 row_anim = "stagger"
 rule     = "hairline"
 footer   = "count_results"
-# Declared-but-not-consumed, exactly like liquid-motion's own launcher block:
-# breadbox's Phase 4b-i wiring only reads mode/width/top/radius/icon_px.
-# row_anim/rule/footer are this theme's demo-derived aspirations breadbox
-# does not implement yet; sections/modes describe today's actual (trivial,
-# apps-only) behaviour but are equally unread by any code path.
 sections = false
 modes    = ["apps"]
+# `.bx .r { border-radius: 6px; margin: 0 6px; padding: 8px 10px }`
+row_radius       = 6
+row_inset        = 6
+row_padding_v    = 8
+row_padding_h    = 10
+# `.bx .ico { border-radius: 5px }` (paired with icon_px = 22 above)
+icon_radius      = 5
+# `.bx .q { padding: 12px 15px; font-size: 14px }`
+search_font_size = 14
+search_padding_v = 12
+search_padding_h = 15
+# `.bx .r.sel { background: rgba(accent, .28) }`
+selection_alpha  = 0.28
 
 # Same four satellite namespaces as liquid-motion, keyed identically so the
 # two manifests validate against the same [compositor.*] keyspace. Offsets