2.0.3 - Gradient Fix

• Fix gradient tags rendering as plain text inside LuckPerms prefixes/suffixes and name formats (issue #5)
• Full MiniMessage gradient parity: named color stops (<gradient:red:blue>), three or more stops, and an optional phase, alongside the existing <gradient:#RRGGBB:#RRGGBB> form
• Named-color gradients now render correctly on the tab list and above-head nameplate (previously the color name was stripped there)
• Note: gradient hex must be 6-digit (#RRGGBB); 3-digit hex is not accepted, matching MiniMessage GitHub release: https://github.com/programmer1o1/playername-styler/releases/tag/v2.0.3