style: follow Pint conventions in terminal lane colors

Place static helpers before instance methods and use multibyte
string operations.

Author: prateekbhujel

app/Services/Terminal/TerminalRenderer.php

@@ -51,6 +51,24 @@ public static function sanitize(string $text): string
         return (string) preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]/', '', $stripped);
     }
 
+    /**
+     * Returns the RGB components of one of the six preset lanes or a custom hex lane.
+     *
+     * @return array{int, int, int}
+     */
+    public static function laneRgb(int|string $lane): array
+    {
+        if (is_int($lane)) {
+            return self::LANES[$lane] ?? self::LANES[0];
+        }
+
+        return [
+            (int) hexdec(mb_substr($lane, 1, 2)),
+            (int) hexdec(mb_substr($lane, 3, 2)),
+            (int) hexdec(mb_substr($lane, 5, 2)),
+        ];
+    }
+
     /**
      * Renders the ASCII art banner.
      */
@@ -247,24 +265,6 @@ public function footer(bool $color = true): string
         ]);
     }
 
-    /**
-     * Returns the RGB components of one of the six preset lanes or a custom hex lane.
-     *
-     * @return array{int, int, int}
-     */
-    public static function laneRgb(int|string $lane): array
-    {
-        if (is_int($lane)) {
-            return self::LANES[$lane] ?? self::LANES[0];
-        }
-
-        return [
-            (int) hexdec(substr($lane, 1, 2)),
-            (int) hexdec(substr($lane, 3, 2)),
-            (int) hexdec(substr($lane, 5, 2)),
-        ];
-    }
-
     /**
      * Resolves the ANSI escape sequence for a user lane (24-bit TrueColor or 16-color ANSI).
      */