screenshots to be used as app previews and created a facebook marketing url

Enhanced Math Equation Display • Mathematical equations now display with proper Unicode symbols for a cleaner, more readable experience • Added support for superscript notation (x², n³, etc.) making powers and exponents easy to read • Added support for subscript notation (x₁, x₂, etc.) for sequences and variables • Greek letters now render properly (α, β, π, θ, Σ, etc.) • Mathematical symbols like ×, ÷, ≤, ≥, √, ∫, ∞, and many more now display correctly • Fractions, square roots, and complex expressions are now formatted for better readability Improved Timetable Scanning • Enhanced AI timetable recognition for more accurate class extraction • Now correctly identifies the number of time slots/periods per day from your timetable • Better handling of different timetable formats (5 periods, 8 periods, etc.) • Improved accuracy - only extracts classes that can be clearly read from the image • Fixed issue where empty cells were incorrectly added as classes • Better detection of timetable grid structure (rows = periods, columns = days) • Reduced false positives - no more made-up classes or teachers