feat: add target rating calculator (#2)

public/css/players.css

@@ -298,3 +298,58 @@
         font-size: 13px;
     }
 }
+
+/* ── Target Rating Calculator ─────────────────── */
+
+.target-rating-icon {
+    color: var(--accent);
+}
+
+#target-rating-form .form-row {
+    display: flex;
+    flex-direction: column;
+    gap: 4px;
+    margin-bottom: 12px;
+}
+
+#target-rating-form .form-row label {
+    font-size: 0.9em;
+}
+
+#target-rating-form .form-row input {
+    padding: 6px 8px;
+}
+
+#target-rating-form .form-actions {
+    display: flex;
+    justify-content: flex-end;
+    margin-top: 8px;
+}
+
+.target-rating-result {
+    margin-top: 16px;
+    padding-top: 12px;
+    border-top: 1px solid var(--border);
+}
+
+.target-rating-result .target-summary div {
+    margin-bottom: 6px;
+}
+
+.target-rating-result .warning {
+    color: var(--down);
+    margin-top: 8px;
+}
+
+.target-rating-result .error {
+    color: var(--red);
+}
+
+.target-rating-result .muted {
+    color: var(--text-muted);
+    font-size: 0.9em;
+}
+
+.target-rating-result .loading {
+    color: var(--text-muted);
+}