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08687295 - Fix bad contrast for highlighted search results in tables (#9863)

Fix bad contrast for highlighted search results in tables (#9863) * Fix bad contrast for highlighted search results in tables `searchMatchColorOpaque` and `activeSearchMatchColorOpaque` are blended over the row background to highlight search matches. They were migrated from `withOpacity(0.5)` to `withValues(alpha: 255 / 2)` in #8784; since `withValues` expects alpha in the range 0.0-1.0, `255 / 2` clamps to fully opaque. Matched rows then got a solid yellow/orange background while the row text kept its theme color, making it unreadable (especially in dark mode). Restore the intended 0.5 alpha so the highlight stays translucent and the row text remains legible, and add a regression test. Fixes #9010 * Rename search match colors to *Translucent; add release note