The "Say Hello?" row at the bottom of the sidebar is now branding: `socialHeading` for the label, `socialLinks` as [{label, url, icon}] where icon is bluesky, discord, a navigation icon name or one of four uploadable slots `socialIcon1`..`socialIcon4` (SVG drawn with currentColor takes the sidebar's icon color; other art renders as drawn). Unset keeps the Streamplace links; an empty list hides the row. Also hoists the branded navigation hooks above the sidebar's early return: shrinking the window past the sidebar breakpoint changed the hook count and threw "Rendered fewer hooks than expected". Claude-Session: https://claude.ai/code/session_014aPQ5yqG9QFxKnbwQfCYKa (cherry picked from commit 9133f94d3510d5754bfcb38a69a9768e0398085a)