crosspoint-reader

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IFAKA 1a53dccebd Fix title truncation crash for short titles (#63 )

## Problem
The status bar title truncation loop crashes when the chapter title is
shorter than 8 characters.

```cpp
// title.length() - 8 underflows when length < 8 (size_t is unsigned)
title = title.substr(0, title.length() - 8) + "...";
```

## Fix
Added a length guard to skip truncation for titles that are too short to
truncate safely.

## Testing
- Builds successfully with `pio run`
- Affects: `src/activities/reader/EpubReaderActivity.cpp`

2025-12-19 23:23:43 +11:00