A drag handle on every page, and copy and wrap for code blocks

The extension now puts a small MemoryLink handle on the edge of every page, so its tools are one click away without a shortcut.

• Drag it anywhere. Let go and it snaps to the nearest edge or corner. It stays there on every tab and every page.
• Click it to take a screenshot, open the command overlay or link an object, with each action's keyboard shortcut shown next to it.
• Hide it from its menu with Disable handle. Turn it back on any time in the extension's Settings.

Code blocks in the editor have two new buttons in their header, next to the language picker.

• Copy puts the whole block on your clipboard in one click. It works in read-only documents too.
• Wrap toggles line wrapping. Turn it off and long lines stay on one line, and you scroll the block sideways to read them. The choice is saved with the block.