SnowRaven Mini has its own raven. The extension icon and the marks in the popup
and Settings were a stock outline bird; they are now a custom raven glyph drawn
for SnowRaven, reversed out in white on the same green tile. Nothing else has
changed: the weather and tide blocks are untouched and still match the SnowRaven
desktop app exactly, the popup works the same way, and no new permission is
requested.

Prevent unnecessary horizonal scrollbar from appearing in pop-up.

Fixes (permanently) a rare popup bug where the window could shrink step by step into a narrow vertical bar. Weather and tide output are unchanged.

Fixed rare error where weather window may shrink when weather is fetched.

Added first-time setup flow.

Added additional accessibility features.