Akiba So
2edb897000
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Extracts the untested ad-hoc arithmetic from pen_editor_screen._centerPage into pure, shared, tested functions: fitWidthScale (fill viewport width — the continuous-single default), fitPageScale (letterboxed min-axis fit), and centerOffset (top-left translation to center scaled content; negative when it overflows/scrolls). Powers the viewport's initial transform + the reader fit-width/fit-page actions. flutter analyze lib/editor clean; 228/228 tests (+5). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>