[othercodes]

Adds webshare ui, a lazygit-style TUI over the account's products: proxies, bandwidth, errors, activity, authorized IPs and sub-users per plan, plus account and subscription screens. Command logic moves to internal/app so the CLI and the TUI share it; billing and purchases stay in the dashboard.

There are no tests for the TUI itself (internal/tui); the shared logic in internal/app is covered through the CLI tests.

To try it locally:

gh pr checkout 5
go build -o webshare .
./webshare login    # or: export WEBSHARE_API_KEY=your-key
./webshare ui

Press ? inside the UI for every keybinding.