assistant: Add debug inspector (#16105)

I went with inline approach directly within the panel.
First, enable workflow debugging in the hamburger menu (this works
retroactively as well):


![image](https://github.com/user-attachments/assets/d2ab8edf-bb7b-49a4-8f70-9a6fe94dc7dd)

This enables debug buttons in the header of each step:

![image](https://github.com/user-attachments/assets/3b5d479f-7473-4c41-a2e7-8c10bb71f0ff)
Enabling one pretty-prints the workflow step internals:

![image](https://github.com/user-attachments/assets/e651e826-1270-49ff-8bb6-046c07c006bf)


Release Notes:

- N/A

crates/ui/src/components/icon.rs

@@ -203,6 +203,7 @@ pub enum IconName {
     MessageBubbles,
     Mic,
     MicMute,
+    Microscope,
     Minimize,
     Option,
     PageDown,
@@ -366,6 +367,7 @@ impl IconName {
             IconName::MessageBubbles => "icons/conversations.svg",
             IconName::Mic => "icons/mic.svg",
             IconName::MicMute => "icons/mic_mute.svg",
+            IconName::Microscope => "icons/microscope.svg",
             IconName::Minimize => "icons/minimize.svg",
             IconName::Option => "icons/option.svg",
             IconName::PageDown => "icons/page_down.svg",