v3.3.0

Added

• Shadow Boost: New slider that recovers dark scene detail using gamma correction — game changer for anime night scenes on IPS panels.
• Anime Preset: Replaces Subtle — tuned for anime with boosted saturation, shadow recovery, and edge sharpening.
• Keyboard Shortcut: Alt+Shift+V toggles the enhancer on/off without leaving fullscreen.
• Import/Export Settings: Back up and share your presets as JSON files.
• Double-Click Slider Reset: Double-click any slider to snap it back to factory default.
• Restricted Page Banner: Shows "Not available on this page" on non-HTTP pages.
• Slider Fill Tracks: Visual fill from left to thumb; warmth slider has a blue-to-orange gradient.
• Toast Notifications: Brief confirmation on import/export actions.
• Centralized Constants: New shared.js file — single source of truth for all presets, ranges, and validation.
• Input Validation: validatePreset() clamps all values to valid ranges on load to prevent corrupted storage.

Fixed

• Intensity Mismatch: Factory defaults were inconsistent between content.js (100) and popup.js (50) — unified.
• Shadow Boost Filter Order: Shadow boost SVG filter now runs before CSS contrast, preventing contrast from crushing blacks before recovery.
• Storage Reads: Switched from get(null) to reading only needed keys.

Changed

• Unique Preset Intensities: Each preset now has a distinct intensity matching its character (25%–80%).
• Preset Tuning: All presets retuned with shadow boost values and refined color profiles.
• var → const/let: Cleaned up variable declarations.