Add example agent tool preview (#28984)

This PR adds an example of rendering previews for tools using the new
Agent ToolCard style.

![CleanShot 2025-04-17 at 13 03
12@2x](https://github.com/user-attachments/assets/d4c7d266-cc32-4038-9170-f3e070fce60e)

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <git@maxdeviant.com>

crates/assistant_tools/Cargo.toml

@@ -16,6 +16,7 @@ anyhow.workspace = true
 assistant_tool.workspace = true
 chrono.workspace = true
 collections.workspace = true
+component.workspace = true
 feature_flags.workspace = true
 futures.workspace = true
 gpui.workspace = true
@@ -24,6 +25,8 @@ http_client.workspace = true
 itertools.workspace = true
 language.workspace = true
 language_model.workspace = true
+linkme.workspace = true
+open.workspace = true
 project.workspace = true
 regex.workspace = true
 schemars.workspace = true
@@ -31,10 +34,9 @@ serde.workspace = true
 serde_json.workspace = true
 ui.workspace = true
 util.workspace = true
-worktree.workspace = true
-open = { workspace = true }
 web_search.workspace = true
 workspace-hack.workspace = true
+worktree.workspace = true
 zed_llm_client.workspace = true
 
 [dev-dependencies]