feat: ithnk full utf8 support & ui 100% consistent

include/ui.h

@@ -5,13 +5,43 @@
 #include "ofield.h"
 #include "util.h"
 
+//    [box_start]
+//    ↓
+// 0 [┌]───────────────────────────────────────────────┐
+// 1  │                                                │
+// 2  │    the-art                2025-06-20 21:40:44  │
+// 3  │                                             |  │
+// 4  │                                             |  │
+// 5  │       xorg   < Default >                    |  │
+// 6  │                                             |  │
+// 7  │       user   javalsai                       |  │
+// 8  │                                             |  │
+// 9  │   password   ________________________________  │
+// 10 │          |                                  |  │
+// 11 └────────────────────────────────────────────────┘
+//    01234567890123456789012345678901234567890123456789
+//    00000000001111111111222222222233333333334444444444
+//    |--|       |   ↑                              |--|[BOX_HMARGIN]
+//    [BOX_HMARGIN]  [VALUES_COL]                    |
+//               |---|[VALUES_SEPR]                  |
+//                  |--------------------------------|[VALUE_MAXLEN]
+
+#define HEAD_ROW 2
+#define SESSION_ROW 5
+#define USER_ROW 7
+#define PASSWD_ROW 9
+
+#define BOX_WIDTH 50
+#define BOX_HEIGHT 12
+#define BOX_HMARGIN 2
+
+#define VALUES_COL 15
+#define VALUES_SEPR 3
+#define VALUE_MAXLEN (BOX_WIDTH - VALUES_COL + 1 - BOX_HMARGIN - 2)
+
 enum input { SESSION, USER, PASSWD };
 extern const u_char inputs_n;
 
-// not customizable (for now)
-extern const uint boxw;
-extern const uint boxh;
-
 void setup(struct config* config);
 int load(struct Vector* users, struct Vector* sessions);
 void print_err(const char*);