Add TerminalView component doc with reconnect behavior

Frontend/TerminalView_Component.md

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+# TerminalView Component
+
+> Status: ✅ Operational
+
+---
+
+## Overview
+
+The terminal console is implemented using:
+
+- **xterm.js** — frontend terminal renderer
+- **WebSocket transport** — connects portal to agent
+- **PTY session** — managed by the agent via `creack/pty`
+
+`TerminalView` owns the WebSocket lifecycle. `ServerConsole` owns policy and session gating.
+
+The file panel does not interrupt the console lifecycle.
+
+---
+
+## Reconnect Behavior
+
+The terminal automatically reconnects when the WebSocket closes unexpectedly.
+
+Behavior:
+
+- Reconnect delay: 1–5 seconds
+- Backoff capped at 5 seconds
+- Console session recreated automatically
+
+The user no longer needs to refresh the page to regain console access after navigating away from the console tab or after a transient disconnect.
+
+---
+
+## Agent Side
+
+- One PTY read loop per `{vmid, container_type}`
+- PTY-backed WebSocket served at `/console/ws`
+- Commands sent via `GET /console/command?cmd=<cmd>` to server stdin
+
+---
+
+## Constraints
+
+- Portal never calls the agent directly — all traffic through API
+- Console does not enforce real policy — agent enforces