The widget now spawns 'claude' via portable-pty, sends /usage, parses the
three rendered bars (Current session / Current week all / Current week
Sonnet), and shows the real percentages in the ring + weekly bars. A
background task refreshes every 5 minutes; the title-bar refresh button
forces an immediate fetch.
Drops the cap-tuning UI and tier card from Settings; adds a 'claude command'
override (e.g. 'wsl.exe -- claude' for Windows-host widgets reading WSL
credentials) and a refresh-interval setting. Fixes title-bar buttons getting
swallowed as drag attempts via data-tauri-drag-region="false".
