Improve UX for saved contexts (#12721)

Release Notes:

- Added search for saved contexts.
- Fixed a bug that caused titles generate by the LLM to be longer than
one line.

crates/assistant/src/assistant.rs

@@ -1,11 +1,11 @@
 pub mod assistant_panel;
 pub mod assistant_settings;
 mod completion_provider;
+mod conversation_store;
 mod inline_assistant;
 mod model_selector;
 mod prompt_library;
 mod prompts;
-mod saved_conversation;
 mod search;
 mod slash_command;
 mod streaming_diff;
@@ -17,10 +17,10 @@ use assistant_slash_command::SlashCommandRegistry;
 use client::{proto, Client};
 use command_palette_hooks::CommandPaletteFilter;
 pub(crate) use completion_provider::*;
+pub(crate) use conversation_store::*;
 use gpui::{actions, AppContext, Global, SharedString, UpdateGlobal};
 pub(crate) use inline_assistant::*;
 pub(crate) use model_selector::*;
-pub(crate) use saved_conversation::*;
 use semantic_index::{CloudEmbeddingProvider, SemanticIndex};
 use serde::{Deserialize, Serialize};
 use settings::{Settings, SettingsStore};