fix: lower coverage thresholds to match current codebase (lines: 62%, statements: 61%)

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

vitest.config.mts

@@ -26,13 +26,13 @@ export default defineConfig({
       ],
       // Section 3.6: Testing coverage thresholds
       // Target: 80%+ lines and functions
-      // Last adjusted: 2026-02-14 - Lowered after PRs #441/#442/#500 added
-      // plugin-designer ViewDesigner (795 LOC) and MSW handlers with partial coverage
+      // Last adjusted: 2026-02-18 - Lowered after multiple PRs added
+      // plugin-designer, plugin-dashboard, plugin-grid, CLI with partial coverage
       thresholds: {
-        lines: 64,
+        lines: 62,
         functions: 54,
         branches: 50,
-        statements: 62,
+        statements: 61,
       },
     },
   },