AI Usage 0.1.8

This release makes multi-provider usage clearer while keeping the menu bar
compact.

Show Claude Code and Codex together, with a separate menu bar toggle for each
installed provider.
Choose the visible metrics directly under each provider in the native
settings popover.
Keep a single selected metric minimal, and add compact labels only when
multiple metrics are shown.
Show Claude Code extra usage and Codex account credits when the provider
returns them.
Default fresh installs and legacy upgrades to Weekly once, then preserve
every later user choice across updates.
Hide tools that are not installed while keeping installed, signed-out
providers visible with an accurate status.

Thanks to @cneren for the initial multi-provider
and credit usage contributions.

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