v1.1.0 — hide-icon + sharp-corners options

Two requested hero options:

• Show icon (default on) — turn off to hide the icon and its square background entirely, for a clean text-only hero.
• Sharp corners (default off) — square edges on the banner, icon badge and stat boxes instead of rounded.

Both are per-context (home + per tag) in the Hero Studio with live preview. Verified on flarum.test.