assistant2: Add profile selector (#27520)

This PR replaces the tool selector with a new profile selector.

<img width="1394" alt="Screenshot 2025-03-26 at 2 35 42 PM"
src="https://github.com/user-attachments/assets/9631c6e9-9c47-411e-b9fc-5d61ed9ca1fe"
/>

<img width="1394" alt="Screenshot 2025-03-26 at 2 35 50 PM"
src="https://github.com/user-attachments/assets/3abe4e08-d044-4d3f-aa95-f472938452a8"
/>

Release Notes:

- N/A

crates/assistant2/src/thread_store.rs

@@ -3,7 +3,8 @@ use std::path::PathBuf;
 use std::sync::Arc;
 
 use anyhow::{anyhow, Result};
-use assistant_tool::{ToolId, ToolWorkingSet};
+use assistant_settings::AssistantSettings;
+use assistant_tool::{ToolId, ToolSource, ToolWorkingSet};
 use chrono::{DateTime, Utc};
 use collections::HashMap;
 use context_server::manager::ContextServerManager;
@@ -19,6 +20,7 @@ use language_model::{LanguageModelToolUseId, Role};
 use project::Project;
 use prompt_store::PromptBuilder;
 use serde::{Deserialize, Serialize};
+use settings::Settings as _;
 use util::ResultExt as _;
 
 use crate::thread::{MessageId, ProjectSnapshot, Thread, ThreadEvent, ThreadId};
@@ -57,6 +59,7 @@ impl ThreadStore {
                 context_server_tool_ids: HashMap::default(),
                 threads: Vec::new(),
             };
+            this.load_default_profile(cx);
             this.register_context_server_handlers(cx);
             this.reload(cx).detach_and_log_err(cx);
 
@@ -184,6 +187,38 @@ impl ThreadStore {
         })
     }
 
+    pub fn load_default_profile(&self, cx: &mut Context<Self>) {
+        let assistant_settings = AssistantSettings::get_global(cx);
+
+        if let Some(profile) = assistant_settings
+            .profiles
+            .get(&assistant_settings.default_profile)
+        {
+            self.tools.disable_source(ToolSource::Native, cx);
+            self.tools.enable(
+                ToolSource::Native,
+                &profile
+                    .tools
+                    .iter()
+                    .filter_map(|(tool, enabled)| enabled.then(|| tool.clone()))
+                    .collect::<Vec<_>>(),
+            );
+
+            for (context_server_id, preset) in &profile.context_servers {
+                self.tools.enable(
+                    ToolSource::ContextServer {
+                        id: context_server_id.clone().into(),
+                    },
+                    &preset
+                        .tools
+                        .iter()
+                        .filter_map(|(tool, enabled)| enabled.then(|| tool.clone()))
+                        .collect::<Vec<_>>(),
+                )
+            }
+        }
+    }
+
     fn register_context_server_handlers(&self, cx: &mut Context<Self>) {
         cx.subscribe(
             &self.context_server_manager.clone(),