Message selector, /rewind, diff dialog and other pickers move to a shared list with generic select:* keybindings

What

Several pickers now use one shared scrolling list component, and their keybinding actions (the names you use in a custom keybindings file) changed with them:

• The default MessageSelector keybinding context is gone. Its actions messageSelector:up, messageSelector:down, messageSelector:top, messageSelector:bottom and messageSelector:select are replaced by select:previous, select:next, select:first, select:last and select:accept.
• Old action names in your own keybindings are rewritten to the new ones automatically, so custom bindings keep working. The rewrite list also includes diff:viewDetails.
• The /rewind message list is rebuilt on the shared list. Each row shows details such as files changed or that there is no code to restore. The old messageSelector:* actions are no longer bound there.
• The diff dialog loses its default enter: "diff:viewDetails" binding, so Enter no longer opens a detail view. Its file list uses the list's own focus and select, and moving to the previous or next file goes through a Select-context binding. One finding reports that a custom binding naming diff:viewDetails may no longer do anything.
• The browser chooser marks the current device with a success icon labelled "current:" instead of a " · current" suffix, and shows at most 5 rows.
• The GCP project picker starts with the configured project focused.

Why

If you have a custom keybindings file that remaps the message selector, it should keep working, but the select:* names are the ones to use from now on. Check any binding that names diff:viewDetails, since that action may no longer do anything.