breadman: rebuild settings with libadwaita components

Proof-of-concept for the ecosystem-wide design-system work: every setting
is now an AdwPreferencesGroup/SwitchRow/SpinRow/ActionRow/ComboRow via
bread-theme::adw, instead of a hand-rolled GtkGrid of labels + raw widgets.

This directly fixes the two worst defects a design critique found here:
- Toggle switches rendered ~1400px wide, like progress bars — caused by
  GtkGrid sizing a switch's column to match a sibling entry's hexpand in
  the same grid, and Switch has no default that resists filling that
  width. AdwSwitchRow owns its own layout, so this class of bug can't
  recur.
- Spin buttons were ~1300px from the label they modified, for the same
  grid-column-sizing reason. AdwSpinRow docks the spinner to its title.

Also softened the jargon-forward section titles the critique flagged
("Model (Tier 2 ONNX)", "Ollama (Tier 3)") — the tier/implementation
detail moved from the title (loud, unavoidable) to each group's
description (quieter, still there for anyone who wants it).

bread-theme now needs a direct dependency here (branch=dev, `adw`
feature) since breadpad-shared's own bread-theme dependency is tag-pinned
to a release before this feature existed.

Cargo.lock

@@ -76,7 +76,7 @@ version = "1.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "40c48f72fd53cd289104fc64099abca73db4166ad86ea0b4341abe65af83dadc"
 dependencies = [
- "windows-sys 0.61.2",
+ "windows-sys 0.60.2",
 ]
 
 [[package]]
@@ -87,7 +87,7 @@ checksum = "291e6a250ff86cd4a820112fb8898808a366d8f9f58ce16d1f538353ad55747d"
 dependencies = [
  "anstyle",
  "once_cell_polyfill",
- "windows-sys 0.61.2",
+ "windows-sys 0.60.2",
 ]
 
 [[package]]
@@ -305,7 +305,7 @@ dependencies = [
 [[package]]
 name = "bread-screenshots"
 version = "0.3.1"
-source = "git+https://git.breadway.dev/Breadway/bread-ecosystem?branch=dev#1a3475bd2358202f60e29c9bd27d06b1428b1a27"
+source = "git+https://git.breadway.dev/Breadway/bread-ecosystem?branch=dev#4e76bc707720fbfc52e19a8cc78f3fb1e6e0a713"
 dependencies = [
  "anyhow",
  "bread-utils",
@@ -323,10 +323,22 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "bread-theme"
+version = "0.3.1"
+source = "git+https://git.breadway.dev/Breadway/bread-ecosystem?branch=dev#4e76bc707720fbfc52e19a8cc78f3fb1e6e0a713"
+dependencies = [
+ "dirs 5.0.1",
+ "gtk4",
+ "libadwaita",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "bread-utils"
 version = "0.3.1"
-source = "git+https://git.breadway.dev/Breadway/bread-ecosystem?branch=dev#1a3475bd2358202f60e29c9bd27d06b1428b1a27"
+source = "git+https://git.breadway.dev/Breadway/bread-ecosystem?branch=dev#4e76bc707720fbfc52e19a8cc78f3fb1e6e0a713"
 dependencies = [
  "dirs 5.0.1",
  "serde",
@@ -339,11 +351,13 @@ version = "0.3.4"
 dependencies = [
  "anyhow",
  "bread-screenshots",
+ "bread-theme 0.3.1",
  "breadpad-shared",
  "chrono",
  "dirs 5.0.1",
  "futures-channel",
  "gtk4",
+ "libadwaita",
  "serde",
  "serde_json",
  "tokio",
@@ -376,7 +390,7 @@ name = "breadpad-shared"
 version = "0.3.4"
 dependencies = [
  "anyhow",
- "bread-theme",
+ "bread-theme 0.2.3",
  "chrono",
  "dirs 5.0.1",
  "ical",
@@ -873,7 +887,7 @@ dependencies = [
  "libc",
  "option-ext",
  "redox_users 0.5.2",
- "windows-sys 0.61.2",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -948,7 +962,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb"
 dependencies = [
  "libc",
- "windows-sys 0.61.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -1259,7 +1273,7 @@ dependencies = [
  "gobject-sys",
  "libc",
  "system-deps",
- "windows-sys 0.61.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -1879,6 +1893,36 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09edd9e8b54e49e587e4f6295a7d29c3ea94d469cb40ab8ca70b288248a81db2"
 
+[[package]]
+name = "libadwaita"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85b9900e67182a4b5b1f157b448d94f0715c8b9770cce21cf000801917f53bfa"
+dependencies = [
+ "gdk4",
+ "gio",
+ "glib",
+ "gtk4",
+ "libadwaita-sys",
+ "pango",
+]
+
+[[package]]
+name = "libadwaita-sys"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28d3c27642b389852aa99341bd4a4c19ec6f8a2b63ebdd7f5ba1952198079ccd"
+dependencies = [
+ "gdk4-sys",
+ "gio-sys",
+ "glib-sys",
+ "gobject-sys",
+ "gtk4-sys",
+ "libc",
+ "pango-sys",
+ "system-deps",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.186"
@@ -2101,7 +2145,7 @@ version = "0.50.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7957b9740744892f114936ab4a57b3f487491bbeafaf8083688b16841a4240e5"
 dependencies = [
- "windows-sys 0.61.2",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -2723,7 +2767,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.61.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -2937,7 +2981,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "52d1cfed4120b4d927bf7c0f86d2087a4a7d6027c906d9f9d525a80573b9be51"
 dependencies = [
  "libc",
- "windows-sys 0.61.2",
+ "windows-sys 0.60.2",
 ]
 
 [[package]]
@@ -3047,7 +3091,7 @@ dependencies = [
  "getrandom 0.4.2",
  "once_cell",
  "rustix",
- "windows-sys 0.61.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -3415,7 +3459,7 @@ checksum = "f2f6fb2847f6742cd76af783a2a2c49e9375d0a111c7bef6f71cd9e738c72d6e"
 dependencies = [
  "memoffset",
  "tempfile",
- "windows-sys 0.61.2",
+ "windows-sys 0.60.2",
 ]
 
 [[package]]