Feature request: configurable default tab

[kman86]

Problem

The UI always opens with the Chat tab active (useState("chat") hardcoded in the main component). For users who primarily use Claude Code via the terminal/shell, the Chat tab is not useful as a landing page.

Proposal

Add a configurable default tab, either via:

1. Environment variable (e.g. DEFAULT_TAB=shell) — easiest for PM2/Docker deployments
2. Settings UI — a dropdown in Settings > Appearance to pick the default tab
3. localStorage persistence — remember the last active tab across page reloads

The tab IDs are already well-defined: chat, shell, files, git.

Workaround

Currently the only option is patching the minified bundle (useState("chat") → useState("shell")), which breaks on every npm update.

Context

Running cloudcli v1.17.1 via PM2 on a Mac Mini as a remote dev station. The Shell tab is the primary workspace; Chat is never used.