feature: clickable status bar

The [spaced repetition plugin](https://github.com/st3v3nmw/obsidian-spaced-repetition) permits clicking the status bar to move to the next note in the queue. (I think (most of?) the magic happens [here in the code](https://github.com/st3v3nmw/obsidian-spaced-repetition/blob/master/src/main.ts#L80).)

It would be cool to have that here as well, as it's one less shortcut to remember.

Start by comparing the referenced spaced repetition implementation in main.ts around line 80, then locate the corresponding status-bar setup in this plugin. Done means clicking the status bar advances to the next note in the queue, with behavior checked through the plugin's existing verification path.

Written by the indexing model from the issue text.