Add biome-ignore backpressure script, convert modals to native <dialog>

Adds scripts/check-lint-ignores.mjs with four enforcement mechanisms:
ratcheting count cap (12 source / 3 test), banned rule prefixes,
required justification, and separate test thresholds. Wired into
pnpm check.

Converts player-management and create-player-modal from div-based
modals to native <dialog> with showModal()/close(), removing 8
biome-ignore comments. Remaining ignores are legitimate (Biome
false positives or stopPropagation wrappers with no fitting role).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/check-lint-ignores.mjs

@@ -0,0 +1,108 @@
+/**
+ * Backpressure check for biome-ignore comments.
+ *
+ * 1. Ratcheting cap — source and test files have separate max counts.
+ *    Lower these numbers as you fix ignores; they can never go up silently.
+ * 2. Banned rules — ignoring certain rule categories is never allowed.
+ * 3. Justification — every ignore must have a non-empty explanation after
+ *    the rule name.
+ */
+
+import { execSync } from "node:child_process";
+import { readFileSync } from "node:fs";
+
+// ── Configuration ──────────────────────────────────────────────────────
+const MAX_SOURCE_IGNORES = 12;
+const MAX_TEST_IGNORES = 3;
+
+/** Rule prefixes that must never be suppressed. */
+const BANNED_PREFIXES = [
+	"lint/security/",
+	"lint/correctness/noGlobalObjectCalls",
+	"lint/correctness/noUnsafeFinally",
+];
+// ───────────────────────────────────────────────────────────────────────
+
+const IGNORE_PATTERN = /biome-ignore\s+([\w/]+)(?::\s*(.*))?/;
+
+function findFiles() {
+	return execSync("git ls-files -- '*.ts' '*.tsx'", { encoding: "utf-8" })
+		.trim()
+		.split("\n")
+		.filter(Boolean);
+}
+
+function isTestFile(path) {
+	return (
+		path.includes("__tests__/") ||
+		path.endsWith(".test.ts") ||
+		path.endsWith(".test.tsx")
+	);
+}
+
+let errors = 0;
+let sourceCount = 0;
+let testCount = 0;
+
+for (const file of findFiles()) {
+	const lines = readFileSync(file, "utf-8").split("\n");
+
+	for (let i = 0; i < lines.length; i++) {
+		const match = lines[i].match(IGNORE_PATTERN);
+		if (!match) continue;
+
+		const rule = match[1];
+		const justification = (match[2] ?? "").trim();
+		const loc = `${file}:${i + 1}`;
+
+		// Count by category
+		if (isTestFile(file)) {
+			testCount++;
+		} else {
+			sourceCount++;
+		}
+
+		// Banned rules
+		for (const prefix of BANNED_PREFIXES) {
+			if (rule.startsWith(prefix)) {
+				console.error(`BANNED: ${loc} — ${rule} must not be suppressed`);
+				errors++;
+			}
+		}
+
+		// Justification required
+		if (!justification) {
+			console.error(
+				`MISSING JUSTIFICATION: ${loc} — biome-ignore ${rule} needs an explanation after the colon`,
+			);
+			errors++;
+		}
+	}
+}
+
+// Ratcheting caps
+if (sourceCount > MAX_SOURCE_IGNORES) {
+	console.error(
+		`SOURCE CAP EXCEEDED: ${sourceCount} biome-ignore comments in source (max ${MAX_SOURCE_IGNORES}). Fix issues and lower the cap.`,
+	);
+	errors++;
+}
+
+if (testCount > MAX_TEST_IGNORES) {
+	console.error(
+		`TEST CAP EXCEEDED: ${testCount} biome-ignore comments in tests (max ${MAX_TEST_IGNORES}). Fix issues and lower the cap.`,
+	);
+	errors++;
+}
+
+// Summary
+console.log(
+	`biome-ignore: ${sourceCount} source (max ${MAX_SOURCE_IGNORES}), ${testCount} test (max ${MAX_TEST_IGNORES})`,
+);
+
+if (errors > 0) {
+	console.error(`\n${errors} problem(s) found.`);
+	process.exit(1);
+} else {
+	console.log("All checks passed.");
+}