A bug fix release, mostly about captures that came back looking
plausible but showing the wrong thing.

• Picking an element pinned to the window (a cookie banner, a
  docked footer, a chat widget) captured the page behind it
  instead.
• Right to left pages came out with their columns in the wrong
  order.
• A scrolling panel taller than the window lost the bottom of
  its content.
• The sticky headers and floating bars setting did nothing on
  Firefox. It works now.
• PDF export could produce a file some readers reject when the
  page title was long.
• Some screens were wrongly told the page was too large to
  capture at full resolution.
• Captures no longer get stuck if the window is minimised or a
  page ignores the element picker, and failures started from the
  keyboard now tell you what went wrong instead of nothing.
• Several editor fixes: Escape during a drag, cropping twice,
  adding two text labels in a row, and the JPEG quality slider
  not remembering itself.

Fixed: Fullshot's own progress card could appear in the top right corner of a full page screenshot. It is now hidden for every photograph.

Fixes for screenshots that came out wrong without saying so.

• Switching tabs during a capture no longer splices the other page into your screenshot. Fullshot stops and tells you instead.
• Fixed faint white lines across very long captures.
• Picking a fixed sidebar or panel now captures the panel, not what was behind it.
• Wide pages no longer lose their right-hand side.
• A failed capture always puts the page back the way it was.
• Capturing part of a mail thread or chat pane keeps your place in it.

Editor:
- Crop now uses the rectangle you drew, not wherever the pointer ended up.
- Copy works on large screenshots.
- Reloading the editor tab no longer loses the screenshot.
- PDF export writes standards-compliant files.