feat: add QSO page filters and fix DXCC entity priority

- Add confirmation type filter (LoTW Only, DCL Only, Both, None)
- Add search box for callsign, entity, and grid square
- Rename "All Confirmation" to "All QSOs" for clarity
- Fix exclusive filter logic using separate SQL conditions
- Add debug logging for filter troubleshooting
- Implement DXCC priority: LoTW > DCL
- Document QSO page filters and DXCC handling in CLAUDE.md

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/backend/services/lotw.service.js

@@ -322,6 +322,8 @@ export async function syncQSOs(userId, lotwUsername, lotwPassword, sinceDate = n
 export async function getUserQSOs(userId, filters = {}, options = {}) {
   const { page = 1, limit = 100 } = options;
 
+  logger.debug('getUserQSOs called', { userId, filters, options });
+
   const conditions = [eq(qsos.userId, userId)];
 
   if (filters.band) conditions.push(eq(qsos.band, filters.band));
@@ -330,20 +332,31 @@ export async function getUserQSOs(userId, filters = {}, options = {}) {
 
   // Confirmation type filter: lotw, dcl, both, none
   if (filters.confirmationType) {
+    logger.debug('Applying confirmation type filter', { confirmationType: filters.confirmationType });
     if (filters.confirmationType === 'lotw') {
+      // LoTW only: Confirmed by LoTW but NOT by DCL
       conditions.push(eq(qsos.lotwQslRstatus, 'Y'));
+      conditions.push(
+        sql`(${qsos.dclQslRstatus} IS NULL OR ${qsos.dclQslRstatus} != 'Y')`
+      );
     } else if (filters.confirmationType === 'dcl') {
+      // DCL only: Confirmed by DCL but NOT by LoTW
       conditions.push(eq(qsos.dclQslRstatus, 'Y'));
+      conditions.push(
+        sql`(${qsos.lotwQslRstatus} IS NULL OR ${qsos.lotwQslRstatus} != 'Y')`
+      );
     } else if (filters.confirmationType === 'both') {
-      conditions.push(and(
-        eq(qsos.lotwQslRstatus, 'Y'),
-        eq(qsos.dclQslRstatus, 'Y')
-      ));
+      // Both confirmed: Confirmed by LoTW AND DCL
+      conditions.push(eq(qsos.lotwQslRstatus, 'Y'));
+      conditions.push(eq(qsos.dclQslRstatus, 'Y'));
     } else if (filters.confirmationType === 'none') {
-      conditions.push(and(
-        sql`${qsos.lotwQslRstatus} IS NULL OR ${qsos.lotwQslRstatus} != 'Y'`,
-        sql`${qsos.dclQslRstatus} IS NULL OR ${qsos.dclQslRstatus} != 'Y'`
-      ));
+      // Not confirmed: Not confirmed by LoTW AND not confirmed by DCL
+      conditions.push(
+        sql`(${qsos.lotwQslRstatus} IS NULL OR ${qsos.lotwQslRstatus} != 'Y')`
+      );
+      conditions.push(
+        sql`(${qsos.dclQslRstatus} IS NULL OR ${qsos.dclQslRstatus} != 'Y')`
+      );
     }
   }