Implemented the Bitcoin Core Logs feature in the existing Bitcoin Status Logs tab.

[R27-pixel]

• Added src/bitcoin_logs.rs for debug.log detection, network-aware path resolution, and nonblocking recent-line reads.
• Added persisted settings for Bitcoin Core data dir and direct log path in src/settings.rs.
• Added real-time refresh state, filtering, scrolling, copy, and path selection actions in src/app.rs and src/main.rs.
• Replaced the placeholder Logs tab with a terminal-style viewer in src/components/bitcoin_status_view.rs.
• Extended Settings with “Bitcoin Core data directory” and “Bitcoin Core log file”.

DRAFT PR

[codecov]

Codecov Report

❌ Patch coverage is 57.62099% with 937 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/components/p2pool_status_view.rs	8.58%	277 Missing ⚠️
src/app.rs	33.43%	219 Missing ⚠️
src/components/bitcoin_status_view.rs	31.97%	183 Missing ⚠️
src/main.rs	44.37%	94 Missing ⚠️
src/components/p2pool_websocket.rs	57.64%	72 Missing ⚠️
src/bitcoin_logs.rs	83.81%	39 Missing ⚠️
src/components/bitcoin_client.rs	89.00%	31 Missing ⚠️
src/components/p2pool_client.rs	96.59%	11 Missing ⚠️
src/config.rs	76.47%	8 Missing ⚠️
src/components/status_bar.rs	92.10%	3 Missing ⚠️

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