Wire breadlock to the bread event bus (app id lock)

Emit bread.lock.locked when ext-session-lock-v1 is accepted and
bread.lock.unlocked after PAM success. Fail-silent if breadd is down.
No command verbs (no pin/blur stubs). breadgreet is not on the bus.

Note that Forgejo Arch registry packages are unsigned (SigLevel=Never
on BOS) without changing the package.yml registry.

Cargo.lock

@@ -64,6 +64,17 @@ dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "bread-shared"
+version = "0.7.0"
+source = "git+https://git.breadway.dev/Breadway/bread?tag=v0.7.0#22e34e2cf2202305d7960759dfccb54dc79f948b"
+dependencies = [
+ "dirs",
+ "serde",
+ "serde_json",
+ "toml 0.8.23",
+]
+
 [[package]]
 name = "bread-theme"
 version = "0.3.1"
@@ -75,6 +86,17 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "bread-utils"
+version = "0.3.1"
+source = "git+https://git.breadway.dev/Breadway/bread-ecosystem?tag=v0.7.1#db2fa3c4b4c1e6933bc5cf62a236d05972fdc886"
+dependencies = [
+ "bread-shared",
+ "dirs",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "breadgreet"
 version = "0.2.0"
@@ -97,10 +119,12 @@ dependencies = [
 name = "breadlock"
 version = "0.2.0"
 dependencies = [
+ "bread-utils",
  "breadlock-ui",
  "chrono",
  "pam-client2",
  "serde",
+ "serde_json",
  "smithay-client-toolkit",
  "thiserror 2.0.18",
  "tiny-skia",