feat: improve inspector UI for processes and fix PTY terminal

- Simplify ProcessRunTab layout: compact form with collapsible Advanced section for timeout/maxOutputBytes
- Rewrite ProcessesTab: collapsible create form, lightweight list items with status dots, clean detail panel with tabs
- Extract error details: use problem.detail instead of generic "Stream Error" title for better error messages
- Fix GhosttyTerminal binary frame parsing: handle server's binary ArrayBuffer control frames (ready/exit/error)
- Enable WebSocket proxying in Vite dev server with ws: true
- Set TERM=xterm-256color default for TTY processes so tools like tmux, vim, htop work out of the box
- Remove orange gradient background from terminal container for cleaner look
- Remove orange left border from selected process list items
- Update inspector CSS with new process/terminal styles

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

frontend/CLAUDE.md

@@ -1,26 +1,4 @@
 # Frontend Instructions
 
-## Inspector Architecture
-
-- Inspector source is `frontend/packages/inspector/`.
-- `/ui/` must use ACP over HTTP (`/v2/rpc`) for session/prompt traffic.
-- Primary flow:
-  - `initialize`
-  - `session/new`
-  - `session/prompt`
-  - `session/update` over SSE
-- Keep backend/protocol changes in client bindings; avoid unnecessary full UI rewrites.
-
-## Testing
-
-Run inspector checks after transport or chat-flow changes:
-```bash
-pnpm --filter @sandbox-agent/inspector test
-pnpm --filter @sandbox-agent/inspector test:agent-browser
-```
-
-## Docs Sync
-
-- Update `docs/inspector.mdx` when `/ui/` behavior changes.
-- Update `docs/sdks/typescript.mdx` when inspector SDK bindings or ACP transport behavior changes.
-
+- When the user asks for UI changes, capture screenshots of the updated UI after implementation and verification.
+- At the end, offer to open those screenshots for the user and provide absolute filesystem paths to the screenshot files.