[CV-7]: [Enhancement] Auto Run Tests (Arc & Line Bits) & Major Bug FIxes

[kool7]

BUG FIXES

• Projects using branch=true in their pytest config were showing 0% because coverage data lives in a different table (arc) than line coverage (line_bits). Fixed the parser to detect and read both.
• Multi-line expressions (like all = [...], function arguments spanning multiple lines, docstrings) were being falsely counted as uncovered lines.
• Coverage percentage (%) is consistent everywhere status bar, sidebar and dashboard were sometimes showing different numbers. All three now use the same calculation and respect the same filters.

FEATURES

• Added "Run pytest" button when no coverage file is found, a popup appears with a "Run pytest" button. Clicking it runs pytest automatically using the project's virtual env shows live output in a panel and auto-loads coverage when done.
• Test files excluded from stats files like test_*.py and anything inside tests/ are excluded from coverage percentages by default (configurable). No more test files skewing your numbers.
• CodeLens skips test files per-function coverage hints no longer appear on test files themselves.
• Dashboard icon the coverage Dashboard tab now has a themed bar-chart icon that works in both light and dark themes.
• File watcher debounced rapid file changes no longer trigger multiple reloads waits 500ms before reloading.