SJ Paint v0.2.21

Edit colors now provides RGB and HSV channel entry with synchronized hex values. Empty, malformed and out-of-range entries cannot accept a stale color. Switching color models preserves exact RGB bytes, and hue edits preserve the precision of untouched channels. Live text selection, cancellation and the existing palette owner are retained.

Verification: 1,000 browser checks on each platform, 459 hidden Windows checks, 454 isolated Linux checks and 47 Linux installer checks passed in CI 38884897297. Each desktop run separately skipped actual AI inference; the earlier pass totals incorrectly included that skipped check. Both archives were produced on the verified runners; Windows and Linux app payloads match exactly. Native chooser responses remain simulated. AI remains deferred, and full Microsoft Paint parity is unfinished.