0.2.8 — Side notch panel, compact tray by default, first-run welcome

Added

Side notch panel

• An opt-in floating strip of per-provider usage rings on the right edge of the screen, just below the menu bar.
• Hovering expands a detail card with per-window bars, percentages, and reset times. The strip can be dragged anywhere, and the position survives relaunches and screen changes.
• Data comes from the same coordinator that feeds the tray and popover; demo mode works unchanged.

First-run welcome

• The popover greets a first run with a page explaining where usage lives now: the compact tray, the side notch panel, and this popover.
• Either button dismisses it permanently. The enable button turns the panel on from the page.

Changed

Compact menu bar by default

• The tray now shows one small app mark (the same fill-gauge geometry the app icon is drawn from) instead of per-provider clusters, so the side notch panel can carry the usage.
• The tray and the panel are independent switches. Compact menu bar in Settings brings the full per-provider clusters back, and existing users who stored a value keep theirs.

Fixed

• The OpenCode Go mark no longer renders as nothing where no bundled logo exists (the SF Symbol fallback carried an invalid name).
• The side notch panel's expanded card no longer strands itself offset inside the window after hover, which clipped the bars and percent column.