Start separating authentication from connection to collab (#35471)

This pull request should be idempotent, but lays the groundwork for
avoiding to connect to collab in order to interact with AI features
provided by Zed.

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <git@maxdeviant.com>
Co-authored-by: Richard Feldman <oss@rtfeldman.com>

crates/agent/src/thread.rs

@@ -12,8 +12,8 @@ use agent_settings::{AgentProfileId, AgentSettings, CompletionMode};
 use anyhow::{Result, anyhow};
 use assistant_tool::{ActionLog, AnyToolCard, Tool, ToolWorkingSet};
 use chrono::{DateTime, Utc};
-use client::{CloudUserStore, ModelRequestUsage, RequestUsage};
-use cloud_llm_client::{CompletionIntent, CompletionRequestStatus, UsageLimit};
+use client::{ModelRequestUsage, RequestUsage};
+use cloud_llm_client::{CompletionIntent, CompletionRequestStatus, Plan, UsageLimit};
 use collections::HashMap;
 use feature_flags::{self, FeatureFlagAppExt};
 use futures::{FutureExt, StreamExt as _, future::Shared};
@@ -37,7 +37,6 @@ use project::{
     git_store::{GitStore, GitStoreCheckpoint, RepositoryState},
 };
 use prompt_store::{ModelContext, PromptBuilder};
-use proto::Plan;
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use settings::Settings;
@@ -374,7 +373,6 @@ pub struct Thread {
     completion_count: usize,
     pending_completions: Vec<PendingCompletion>,
     project: Entity<Project>,
-    cloud_user_store: Entity<CloudUserStore>,
     prompt_builder: Arc<PromptBuilder>,
     tools: Entity<ToolWorkingSet>,
     tool_use: ToolUseState,
@@ -445,7 +443,6 @@ pub struct ExceededWindowError {
 impl Thread {
     pub fn new(
         project: Entity<Project>,
-        cloud_user_store: Entity<CloudUserStore>,
         tools: Entity<ToolWorkingSet>,
         prompt_builder: Arc<PromptBuilder>,
         system_prompt: SharedProjectContext,
@@ -472,7 +469,6 @@ impl Thread {
             completion_count: 0,
             pending_completions: Vec::new(),
             project: project.clone(),
-            cloud_user_store,
             prompt_builder,
             tools: tools.clone(),
             last_restore_checkpoint: None,
@@ -506,7 +502,6 @@ impl Thread {
         id: ThreadId,
         serialized: SerializedThread,
         project: Entity<Project>,
-        cloud_user_store: Entity<CloudUserStore>,
         tools: Entity<ToolWorkingSet>,
         prompt_builder: Arc<PromptBuilder>,
         project_context: SharedProjectContext,
@@ -607,7 +602,6 @@ impl Thread {
             last_restore_checkpoint: None,
             pending_checkpoint: None,
             project: project.clone(),
-            cloud_user_store,
             prompt_builder,
             tools: tools.clone(),
             tool_use,
@@ -3260,15 +3254,18 @@ impl Thread {
     }
 
     fn update_model_request_usage(&self, amount: u32, limit: UsageLimit, cx: &mut Context<Self>) {
-        self.cloud_user_store.update(cx, |cloud_user_store, cx| {
-            cloud_user_store.update_model_request_usage(
-                ModelRequestUsage(RequestUsage {
-                    amount: amount as i32,
-                    limit,
-                }),
-                cx,
-            )
-        });
+        self.project
+            .read(cx)
+            .user_store()
+            .update(cx, |user_store, cx| {
+                user_store.update_model_request_usage(
+                    ModelRequestUsage(RequestUsage {
+                        amount: amount as i32,
+                        limit,
+                    }),
+                    cx,
+                )
+            });
     }
 
     pub fn deny_tool_use(
@@ -3886,7 +3883,6 @@ fn main() {{
                     thread.id.clone(),
                     serialized,
                     thread.project.clone(),
-                    thread.cloud_user_store.clone(),
                     thread.tools.clone(),
                     thread.prompt_builder.clone(),
                     thread.project_context.clone(),
@@ -5483,16 +5479,10 @@ fn main() {{
         let (workspace, cx) =
             cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
 
-        let (client, user_store) =
-            project.read_with(cx, |project, _cx| (project.client(), project.user_store()));
-        let cloud_user_store =
-            cx.new(|cx| CloudUserStore::new(client.cloud_client(), user_store, cx));
-
         let thread_store = cx
             .update(|_, cx| {
                 ThreadStore::load(
                     project.clone(),
-                    cloud_user_store,
                     cx.new(|_| ToolWorkingSet::default()),
                     None,
                     Arc::new(PromptBuilder::new(None).unwrap()),