IFAKA adfeee063f Handle empty spine in getBookSize() and calculateProgress() (#67) ...

## Problem
- `getBookSize()` calls `getCumulativeSpineItemSize(getSpineItemsCount()
- 1)` which passes -1 when spine is empty
- `calculateProgress()` then divides by zero when book size is 0

## Fix
- Return 0 from `getBookSize()` if spine is empty
- Return 0 from `calculateProgress()` if book size is 0

## Testing
- Builds successfully with `pio run`
- Affects: `lib/Epub/Epub.cpp`

2025-12-19 23:28:36 +11:00

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