gpui: Prevent idle sleep during AI response streaming

Cargo.toml

@@ -523,6 +523,7 @@ any_vec = "0.14"
 anyhow = "1.0.86"
 ashpd = { version = "0.13", default-features = false, features = [
     "async-io",
+    "inhibit",
     "notification",
     "open_uri",
     "file_chooser",
@@ -953,6 +954,7 @@ features = [
     "Win32_System_Ole",
     "Win32_System_Performance",
     "Win32_System_Pipes",
+    "Win32_System_Power",
     "Win32_System_RestartManager",
     "Win32_System_SystemInformation",
     "Win32_System_SystemServices",

assets/settings/default.json

@@ -1330,6 +1330,10 @@
     //
     // Default: never
     "play_sound_when_agent_done": "never",
+    // Whether to keep the system awake while agent threads are running.
+    //
+    // Default: true
+    "prevent_idle_sleep": true,
     // Whether to have edit cards in the agent panel expanded, showing a preview of the full diff.
     //
     // Default: true

crates/acp_thread/Cargo.toml

@@ -17,6 +17,7 @@ test-support = ["gpui/test-support", "project/test-support", "dep:parking_lot"]
 
 [dependencies]
 action_log.workspace = true
+agent_settings.workspace = true
 agent-client-protocol.workspace = true
 async-channel.workspace = true
 base64.workspace = true