feat: add support for file history snapshots in conversation components

- Introduced a new `FileHistorySnapshotConversationContent` component to handle rendering of file history snapshots.
- Updated `ConversationItem` and `ConversationList` to accommodate the new conversation type.
- Modified the conversation schema to include `FileHistorySnapshotEntrySchema` and related types.
- Enhanced the `useSidechain` hook to filter out file history snapshots from sidechain conversations.
- Adjusted the `SidechainConversationModal` to correctly handle the new conversation type.

src/server/core/claude-code/presentation/ClaudeCodeController.ts

@@ -64,7 +64,7 @@ const LayerImpl = Effect.gen(function* () {
         response: {
           globalCommands: globalCommands,
           projectCommands: projectCommands,
-          defaultCommands: ["init", "compact"],
+          defaultCommands: ["init", "compact", "security-review", "review"],
         },
         status: 200,
       } as const satisfies ControllerResponse;