Regional-indicator flag emoji render as bare "GB"/"DE" text on stock
Windows (no color-flag font substitution), which defeated the point
of switching from text labels to flags — swaps in small inline SVG
flag components instead, guaranteed to render everywhere.
Also re-crops the app-preview screenshot: the original had a wide
empty gap between the sidebar and the feed column baked into the
capture (an artifact of the live app's centered-column layout at that
viewport width). Stitches the sidebar and feed regions together
tightly via sharp instead.