feat(zipcode): compact column widths for popup; ensure no horizontal scroll within dialog

- ZipcodeTable: dynamic widths; shrink columns when target width < standard
- Use computed widths for header and rows; actions width fixed
- Works with tableMaxWidthFraction from ZipcodeSearchScreen],

lib/screens/zipcode/components/zipcode_table.dart

@@ -35,15 +35,51 @@ class ZipcodeTable extends StatelessWidget {
             child: LayoutBuilder(
               builder: (context, constraints) {
                 // 고정폭 + 마지막 filler
-                const double minW = 160 + 180 + 180 + 320 + 140 + 24;
+                // Standard widths
+                const double zipStd = 160.0;
+                const double sidoStd = 180.0;
+                const double guStd = 180.0;
+                const double etcStd = 320.0;
+                const double actionsStd = 140.0;
+                const double fudge = 24.0; // internal paddings/margins
+
                 final double viewportW = constraints.maxWidth.isFinite
                     ? constraints.maxWidth
                     : MediaQuery.sizeOf(context).width;
-                final double cappedW = maxWidthCap != null
+                final double targetW = maxWidthCap != null
                     ? math.min(viewportW, maxWidthCap!)
                     : viewportW;
-                final double tableW = cappedW >= minW ? cappedW : minW;
-                const double etcW = 320.0;
+
+                final double stdMin = zipStd + sidoStd + guStd + etcStd + actionsStd + fudge;
+                final bool compact = targetW < stdMin;
+
+                // Effective widths
+                double zipW;
+                double sidoW;
+                double guW;
+                double etcW;
+                double actionsW;
+                bool includeFiller;
+
+                if (!compact) {
+                  zipW = zipStd;
+                  sidoW = sidoStd;
+                  guW = guStd;
+                  etcW = etcStd;
+                  actionsW = actionsStd;
+                  includeFiller = true; // use remaining width as filler column
+                } else {
+                  // Compact widths to fit inside targetW without horizontal scroll
+                  zipW = 110.0;
+                  sidoW = 120.0;
+                  guW = 120.0;
+                  actionsW = 110.0;
+                  final double remaining = targetW - fudge - (zipW + sidoW + guW + actionsW);
+                  etcW = math.max(180.0, remaining);
+                  includeFiller = false; // no filler in compact mode
+                }
+
+                final double tableW = targetW;
 
                 return SingleChildScrollView(
                   scrollDirection: Axis.horizontal,
@@ -53,17 +89,19 @@ class ZipcodeTable extends StatelessWidget {
                       columnSpanExtent: (index) {
                         switch (index) {
                           case 0:
-                            return const FixedTableSpanExtent(160); // 우편번호
+                            return FixedTableSpanExtent(zipW); // 우편번호
                           case 1:
-                            return const FixedTableSpanExtent(180); // 시도
+                            return FixedTableSpanExtent(sidoW); // 시도
                           case 2:
-                            return const FixedTableSpanExtent(180); // 구/군
+                            return FixedTableSpanExtent(guW); // 구/군
                           case 3:
-                            return const FixedTableSpanExtent(etcW); // 상세주소
+                            return FixedTableSpanExtent(etcW); // 상세주소
                           case 4:
-                            return const FixedTableSpanExtent(140); // 작업
+                            return FixedTableSpanExtent(actionsW); // 작업
                           case 5:
-                            return const RemainingTableSpanExtent(); // filler
+                            return includeFiller
+                                ? const RemainingTableSpanExtent()
+                                : const FixedTableSpanExtent(0);
                           default:
                             return const FixedTableSpanExtent(100);
                         }
@@ -73,15 +111,15 @@ class ZipcodeTable extends StatelessWidget {
                         const ShadTableCell.header(child: Text('시도')),
                         const ShadTableCell.header(child: Text('구/군')),
                         ShadTableCell.header(child: SizedBox(width: etcW, child: const Text('상세주소'))),
-                        const ShadTableCell.header(child: Text('작업')),
-                        const ShadTableCell.header(child: SizedBox.shrink()),
+                        ShadTableCell.header(child: SizedBox(width: actionsW, child: const Text('작업'))),
+                        if (includeFiller) const ShadTableCell.header(child: SizedBox.shrink()),
                       ],
                       children: zipcodes.map((zipcode) {
                         return [
                       // 우편번호 (오버플로우 방지)
                       ShadTableCell(
                         child: SizedBox(
-                          width: 160,
+                          width: zipW,
                           child: FittedBox(
                             alignment: Alignment.centerLeft,
                             fit: BoxFit.scaleDown,
@@ -138,13 +176,16 @@ class ZipcodeTable extends StatelessWidget {
                           ),
                           // 작업
                           ShadTableCell(
+                            child: SizedBox(
+                              width: actionsW,
                               child: ShadButton(
                                 onPressed: () => onSelect(zipcode),
                                 size: ShadButtonSize.sm,
                                 child: const Text('선택', style: TextStyle(fontSize: 11)),
                               ),
                             ),
-                          const ShadTableCell(child: SizedBox.shrink()),
+                          ),
+                          if (includeFiller) const ShadTableCell(child: SizedBox.shrink()),
                       ];
                     }).toList(),
                   ),