Extract bos-settings to its own repo; add breadhelp; JSON-driven Hyprland config

bos-settings moves to git.breadway.dev/Breadway/bos-settings (full history
preserved via git-filter-repo) so its release cadence is decoupled from
BOS's own. breadhelp takes its place as this repo's workspace member: a
GTK4 onboarding/help center replacing the old bos-welcome/bos-keybinds
bash scripts with searchable guides, an interactive keybind viewer
(sourced from the new keybinds.toml, not parsed out of hyprland.lua or
hardcoded), a troubleshooting wizard with one-click fixes, and a proper
first-run tour. bos-netcheck extracts bos-welcome's network-check half,
which still needs to run every login independent of breadhelp's own
first-run gating.

hyprland.lua's keybinds/settings/monitors/autostart are now JSON-driven
(binds.json/settings.json/monitors.json/autostart.json) with every
loader pcall-wrapped and falling back to hardcoded defaults per field on
bad or missing config, so bread* apps (bos-settings' new editors, and
breadhelp's keybind viewer) can read/write this config without ever
being able to leave the compositor unable to start.

CI's package.yml now builds breadhelp instead of bos-settings on tag
push; bos-settings needs its own equivalent workflow in its new repo
(not yet set up).

breadhelp/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "breadhelp"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+gtk4 = { version = "0.11", features = ["v4_12"] }
+glib = "0.22"
+# Shared ecosystem theming — same generated stylesheet bos-settings/breadbar/
+# breadbox/breadpad load, so this looks like part of the same desktop.
+bread-theme = { git = "https://github.com/Breadway/bread-ecosystem", tag = "v0.2.10", features = ["gtk"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+toml = "0.8"
+# Non-destructive state editing (mirrors bos-settings/src/config/mod.rs).
+toml_edit = "0.22"
+async-channel = "2"