feat: fold dashboard cards and a reload button

Each Dashboard card gets a fold button in its title bar. Folded, it
shrinks to one grid row ending at the title bar and cannot be resized;
its height is kept in localStorage (deckit.folded) and restored on
unfold. The grid floats, so nothing moved into the rows a folded card
gave back: cards below it in its columns are pulled up as far as the
space is free, on fold and again once every card has mounted, since a
card restored folded from storage never folds at runtime. Unfolding
needs no mirror; the grid pushes down whatever the regrown card hits.

The installed web app has no browser chrome and so no pull-to-refresh,
which left no way to load new page code on the tablet. A reload button
sits at the top right; JS and CSS are served no-store, so it always
fetches the current code.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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