Martin feedback round 3: dropdown still looked 'fuerchterlich' even
with the official flag-icons. Root cause: 14px vertical padding
around an 18px-tall flag meant the flag occupied only 39% of the
trigger height and was dwarfed by whitespace. Plus a 1px black
box-shadow border made flags look 'boxy', and loading='lazy' caused
empty boxes on the four menu flags the moment the <details> opened.
Changes:
- Flag size 24x18 -> 32x24 (+78% area, ~4:3 matches flag-icons)
- Trigger padding 14px 8px -> 6px (flag now 73% of trigger width,
55% of trigger height, was 46%/39%)
- Drop the artificial 1px black box-shadow outline on flags
- Drop border-radius on flags (real flag-icons look better as
crisp rectangles)
- Drop object-fit: cover (no longer needed for SVG)
- Drop loading='lazy' and decoding='async' (4 small SVGs, must
be ready the moment <details> opens, not flash empty boxes)
- min-height: 44px restored on trigger for WCAG 2.5.5 touch target
- Menu border-radius 8 -> 10px, padding tightened, font-size 0.85
-> 0.9rem for label legibility
- Two-layer box-shadow on menu for subtle elevation
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