style(popup): polish provider screens (#378)

Group reset credits into the Credits section, dim unselected provider tab
icons while keeping their hue, center a muted glyph in the connection-error
state, gate account tooltips on truncation, and hold the accounts header
steady while loading. Refresh the README popup captures and tour GIF.
e20ccafc61Simone committed on 9/25/2026, 9:17:11 PM· committed by GitHubparentf18f827
12 files changedLine totals unavailable