v1.3.0

Changelog

• bff96bc Merge pull request #70 from shnupta/colour-refresh
• 80644d6 Merge pull request #71 from shnupta/tree-sidebar
• 48a1d32 Merge pull request #72 from shnupta/tree-sidebar
• 65ebf19 Merge pull request #73 from shnupta/fix-header-bg
• a1cd4c8 feat: tree view sidebar — ├─/└─ connectors, ▶/▼ group toggles, last-child detection, state bg tints
• 8958006 fix: restore full-width purple header bar — carry bg colour through inner spans
• 1b1afd4 fix: solid purple header — explicit bg on all spans including gap fill
• 5b19a9b style: colour refresh — state-tinted rows, coloured stats pills, review diff bg tints, INSERT/FILTER bars