Adjust model selector popover design (#15056)

This PR mostly refines the model selector popover design by formatting
the models names' and adjusting spacing/alignment in the list-related
items. The list component changes could've been made in a separate PR
but it was also very practical to do it here as I was already
in-context. Either way, I'm happy to separate if that's better!

One thing I couldn't necessarily figure out, though, is why the order
changed (e.g., Anthropic at last ). I wonder if that was because of the
separator logic somehow? I'd love guidance here—new to Rust!

| Before | After |
|--------|--------|
| <img width="228" alt="Screenshot 2024-07-23 at 21 02 33"
src="https://github.com/user-attachments/assets/3372c6c9-08dc-4d71-9265-26f015e2dbc2">
| <img width="228" alt="Screenshot 2024-07-23 at 21 01 45"
src="https://github.com/user-attachments/assets/624cc7db-a3d9-48e3-99d7-c29829501130">
|

---

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>
Co-authored-by: Bennet Bo Fenner <bennet@zed.dev>
Co-authored-by: Antonio <antonio@zed.dev>
Co-authored-by: Antonio Scandurra <me@as-cii.com>

crates/language_model/src/provider/anthropic.rs

@@ -1,5 +1,6 @@
 use anthropic::{stream_completion, Request, RequestMessage};
 use anyhow::{anyhow, Result};
+use collections::BTreeMap;
 use editor::{Editor, EditorElement, EditorStyle};
 use futures::{future::BoxFuture, stream::BoxStream, FutureExt, StreamExt};
 use gpui::{
@@ -8,7 +9,7 @@ use gpui::{
 };
 use http_client::HttpClient;
 use settings::{Settings, SettingsStore};
-use std::{collections::BTreeMap, sync::Arc, time::Duration};
+use std::{sync::Arc, time::Duration};
 use strum::IntoEnumIterator;
 use theme::ThemeSettings;
 use ui::prelude::*;

crates/language_model/src/provider/cloud.rs

@@ -6,10 +6,11 @@ use crate::{
 };
 use anyhow::Result;
 use client::Client;
+use collections::BTreeMap;
 use futures::{future::BoxFuture, stream::BoxStream, FutureExt, StreamExt, TryFutureExt};
 use gpui::{AnyView, AppContext, AsyncAppContext, Subscription, Task};
 use settings::{Settings, SettingsStore};
-use std::{collections::BTreeMap, sync::Arc};
+use std::sync::Arc;
 use strum::IntoEnumIterator;
 use ui::prelude::*;
 

crates/language_model/src/provider/ollama.rs

@@ -75,12 +75,12 @@ impl OllamaLanguageModelProvider {
                 http_client,
                 available_models: Default::default(),
                 _subscription: cx.observe_global::<SettingsStore>(|this: &mut State, cx| {
-                    this.fetch_models(cx).detach_and_log_err(cx);
+                    this.fetch_models(cx).detach();
                     cx.notify();
                 }),
             }),
         };
-        this.fetch_models(cx).detach_and_log_err(cx);
+        this.fetch_models(cx).detach();
         this
     }