bos-settings: full, non-destructive control of every bread* config

The bread/breadpad/breadcrumbs/breadbox views wrote invented schemas
(e.g. top-level log_level, [[profile]] name/ssids) that did not match the
apps' real TOML, so they showed empty and — worse — clobbered the real
config on Save, since the old config::save serialized only the keys it
modelled.

Rework the config layer onto toml_edit: parse each file into a
DocumentMut, mutate only the specific keys a view exposes, and write it
back preserving comments and any unmodelled keys (calendar password,
saved-network passwords, model paths). Unit-tested.

Add ui/widgets.rs (switch/entry/password/dropdown/spin/float/csv rows +
view scaffold + save button) bound to the shared document, then rewrite
the four views against the real schemas with far more coverage:

- bread: [daemon], [lua], [modules], all five [adapters.*] with their
  sub-options, [events], [notifications]
- breadpad: [settings], [model] + [model.ollama], [reminders], [calendar]
- breadcrumbs: [settings] (7 keys), [[networks]] editor, [profiles.*] editor
- breadbox: fixed to real [[contexts]] name/priority array editor

Goal: configure everything from the GUI rather than hand-editing TOML.

Cargo.lock

@@ -28,7 +28,7 @@ checksum = "b4388bee8683e3d04af747c73422af53102d2bd24d9eadb6cbc100baef4b43f8"
 
 [[package]]
 name = "bos-settings"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "async-channel",
  "glib",
@@ -36,6 +36,7 @@ dependencies = [
  "serde",
  "serde_json",
  "toml 0.8.23",
+ "toml_edit 0.22.27",
 ]
 
 [[package]]