Focus mode dims unfocused paragraphs to 50% opacity in dark mode, rendering light text on dark backgrounds unreadable.

Changes

• Increased dark mode dimmed text opacity from 0.5 to 0.65 in EditorView.swift:666
• Light mode remains at 0.3 opacity (dark text on light backgrounds maintains readability at lower opacity)

// Before: unfocused text at 50% opacity in dark mode
let dimmedAlpha: CGFloat = isDarkMode ? 0.5 : 0.3

// After: unfocused text at 65% opacity in dark mode
let dimmedAlpha: CGFloat = isDarkMode ? 0.65 : 0.3

The asymmetry accounts for perceptual differences: light-on-dark requires higher opacity than dark-on-light for equivalent perceived visibility.

• Fixes Regression: dark mode not compatible with focus mode #38

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