feat(ui/ux): unify typography to Pretendard and enforce read-only view mode as default

- Set global font-family to Pretendard and letter-spacing to -0.02em.
- Standardized table header font-size to var(--fs-sm).
- Fixed table clipping and sticky header behavior at 1920x1080.
- Implemented dynamic select options in search filters.
- Enforced 'view' mode as default for all asset modals (PC, Server, SW, etc.).
- Improved Modal logic to ensure all fields (including dynamic rows) are correctly locked.
- Updated Location View detail button from 'Edit' to 'View'.
- Updated design_rule.md to reflect new typography standards.

src/components/Modal/PartsMasterModal.ts

@@ -137,14 +137,10 @@ class PartsMasterModal extends BaseModal {
 
     deleteBtn.style.display = (mode === 'add') ? 'none' : 'block';
 
-    if (mode === 'add') {
-      this.setEditLockMode('edit');
-      this.isEditMode = true;
-      saveBtn.textContent = '등록';
+    if (mode === 'add' || mode === 'edit') {
+      saveBtn.textContent = (mode === 'add') ? '등록' : '저장';
       saveBtn.style.display = 'block';
     } else {
-      this.setEditLockMode('view');
-      this.isEditMode = false;
       saveBtn.textContent = '수정';
       saveBtn.style.display = 'block';
     }