refactor(ipc): complete tauri-specta typed-IPC cutover, contract guards, and layering cleanup (#1230)

src-tauri/Cargo.lock

@@ -4187,6 +4187,7 @@ dependencies = [
  "rusqlite",
  "serde",
  "serde_json",
+ "specta",
  "symphonia",
  "symphonia-adapter-libopus",
  "tauri",
@@ -4212,6 +4213,7 @@ dependencies = [
  "rodio",
  "serde",
  "serde_json",
+ "specta",
  "symphonia",
  "symphonia-adapter-libopus",
  "tauri",
@@ -4230,6 +4232,7 @@ dependencies = [
  "libc",
  "reqwest",
  "serde",
+ "specta",
  "tauri",
  "url",
 ]
@@ -4245,6 +4248,7 @@ dependencies = [
  "reqwest",
  "serde",
  "serde_json",
+ "specta",
  "tauri",
  "tokio",
  "url",
@@ -4282,6 +4286,7 @@ dependencies = [
  "reqwest",
  "serde",
  "serde_json",
+ "specta",
  "sysinfo",
  "tauri",
  "tauri-plugin-process",