dailz cfbe4900a5 feat(core): add LineSampler for fast line count estimation
Implement head/tail 64KB sampling to estimate total line count without scanning the entire file. Also provide read_first_lines() for reading the first N lines for immediate display during progressive loading.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
2026-04-14 09:06:42 +08:00
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