Release v5.2.0

• chore: bump version to 5.2.0 (b6b10e9)
• feat(i18n): add uk/ru/en translations for position settings (11cf2cf)
• style(popup): reduce popup height to 520px (452262f)
• fix(popup): sticky header and tab bar on scroll (935c938)
• fix(ui): prevent container snap-back during AI processing (bfc397d)
• feat(ui): default position 3x3 grid + remember drag toggle (936796f)