linux: Prompt library fixes (#16850)

This PR fixes two issues:
1. The prompt library window didn't set an `app_id` on Linux, which
caused it to be missing the Zed logo
2. A dangling reference to the window in the Wayland client code, which
caused the prompt library window not to close. See:
https://github.com/zed-industries/zed/pull/13201

Release Notes:

- Linux: Fixed the prompt library not closing on Wayland

---------

Co-authored-by: Junkui Zhang <364772080@qq.com>

crates/assistant/Cargo.toml

@@ -32,8 +32,8 @@ client.workspace = true
 clock.workspace = true
 collections.workspace = true
 command_palette_hooks.workspace = true
-db.workspace = true
 context_servers.workspace = true
+db.workspace = true
 editor.workspace = true
 feature_flags.workspace = true
 fs.workspace = true
@@ -58,9 +58,11 @@ open_ai = { workspace = true, features = ["schemars"] }
 ordered-float.workspace = true
 parking_lot.workspace = true
 paths.workspace = true
+picker.workspace = true
 project.workspace = true
 proto.workspace = true
 regex.workspace = true
+release_channel.workspace = true
 rope.workspace = true
 schemars.workspace = true
 search.workspace = true
@@ -68,8 +70,8 @@ semantic_index.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 settings.workspace = true
-smallvec.workspace = true
 similar.workspace = true
+smallvec.workspace = true
 smol.workspace = true
 telemetry_events.workspace = true
 terminal.workspace = true
@@ -81,7 +83,6 @@ ui.workspace = true
 util.workspace = true
 uuid.workspace = true
 workspace.workspace = true
-picker.workspace = true
 zed_actions.workspace = true
 
 [dev-dependencies]