refactor: clean up duplicate imports and dead code

- Merge type and value imports from the same module into single imports
- Remove dead import-badges action (flow uses /api/admin/import/badges)
- Remove unused babel-plugin-react-compiler devDependency
- Remove stray test.txt file
- Update knip config: track css imports, drop redundant ignore entries
- Update contract test to drop obsolete dead-action assertion

src/lib/import-backend-contract.test.ts

@@ -45,9 +45,6 @@ describe("admin import backend contract", () => {
 		expect(service).toContain("ExternalTexts.json");
 		expect(service).toContain("WebsiteBadges");
 		expect(service).toContain("importBadgeSynced");
-		expect(readFileSync("src/actions/import-badges.ts", "utf8")).toContain(
-			"importBadgeSynced",
-		);
 		expect(
 			readFileSync("src/app/api/admin/import/badges/route.ts", "utf8"),
 		).toContain("importBadgeSynced");