[mostafasadeghidev]

Split out of #501, per review: minimize alone, on main.

What

A minimizable prop on FloatingWindow adds a collapse control beside Close that folds the window to its title bar. Header actions fold with the body they act on. The upload queue and the bulk edit window opt in.

The media viewer builds its own shell rather than FloatingWindow, so it wires the same control itself.

Why

The upload queue mid-transfer, a bulk edit mid-review, the viewer beside the grid: closing loses the panel, and keeping it covers the grid.

Details

• The viewer's height is a fixed length, so hiding the body alone left a full-size empty pane under the title bar. data-minimized collapses the height as well, while the top offset still clamps against the full height, so a window folded near the bottom edge doesn't jump.
• Minimized state is per-session, and a folded window stays where it sits. The position is the user's own, and folding to a corner would discard it.

Tests

minimizeWindow.test.tsx renders the real FloatingWindow and MediaViewerWindow and presses the real control. Each was checked against a window that hides nothing or keeps its height.

Overlaps

This touches the same lines as #500 (FloatingWindow: its useTopmostEscape call sits beside the new state) and as #497/#507 (MediaViewerWindow's header). Each overlap is a line or two, and whichever lands second is a trivial rebase. I'll do it.

Verification

bunx tsc -b                                       clean
bunx eslint src/admin/shared/FloatingWindow src/admin/pages/media   clean
bun test src/__tests__/media                      all pass

Docs: docs/features/media.md, Floating windows.