Enhance LogViewer functionality

[rock3r]

• Modified LogcatLogRepository to return logs in ascending chronological order and improved parsing to handle multi-line entries like stack traces.
• Updated LogViewerScreen to utilize rememberLazyListState and implement an initial scroll-to-bottom behavior using LaunchedEffect.
• Improved log readability by appending continuation lines to their parent log entries.

These changes ensure that logs are displayed in a more natural chronological flow while ensuring the most recent entries are immediately visible upon loading.

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Note

Medium Risk
Moderate risk: changes log parsing/order and UI scrolling behavior, which can affect log visibility and performance but is not security- or data-critical.

Overview
Improves the in-app log viewer by adding an initial scroll-to-latest behavior via rememberLazyListState + LaunchedEffect, without forcing subsequent auto-scrolling.

Refactors logcat ingestion by extracting a testable LogcatLogParser that skips logcat buffer separator lines and folds multi-line continuations (e.g., stack traces) into the previous LogEntry, and updates LogcatLogRepository.refresh() to use it. Adds unit tests covering parsing, continuation handling, and all log levels, plus a small README wording tweak ("multi-vendor" -> "multivendor").

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