Remove public internet features and fix upstream source UI (#107)

frontend/src/pages/AdminCachePage.css

@@ -156,6 +156,7 @@
 .source-name {
   font-weight: 500;
   color: var(--text-primary);
+  white-space: nowrap;
 }
 
 .url-cell {
@@ -168,7 +169,6 @@
 }
 
 /* Badges */
-.public-badge,
 .env-badge,
 .status-badge {
   display: inline-block;
@@ -179,11 +179,6 @@
   margin-left: 0.5rem;
 }
 
-.public-badge {
-  background-color: #e3f2fd;
-  color: #1976d2;
-}
-
 .env-badge {
   background-color: #fff3e0;
   color: #e65100;
@@ -213,17 +208,64 @@
 }
 
 .test-result {
-  display: inline-block;
-  margin-left: 0.5rem;
-  font-size: 0.85rem;
+  display: inline-flex;
+  align-items: center;
+  gap: 0.25rem;
+  padding: 0.2rem 0.5rem;
+  border-radius: 4px;
+  font-size: 0.75rem;
+  font-weight: 500;
+  white-space: nowrap;
 }
 
 .test-result.success {
+  background-color: #e8f5e9;
   color: #2e7d32;
 }
 
 .test-result.failure {
+  background-color: #ffebee;
   color: #c62828;
+  cursor: pointer;
+}
+
+.test-result.failure:hover {
+  background-color: #ffcdd2;
+}
+
+.test-result.testing {
+  background-color: #e3f2fd;
+  color: #1976d2;
+}
+
+/* Error Modal */
+.error-modal-content {
+  background: var(--bg-primary);
+  border-radius: 8px;
+  padding: 2rem;
+  width: 100%;
+  max-width: 500px;
+}
+
+.error-modal-content h3 {
+  margin-top: 0;
+  color: #c62828;
+}
+
+.error-modal-content .error-details {
+  background: var(--bg-tertiary);
+  padding: 1rem;
+  border-radius: 4px;
+  font-family: monospace;
+  font-size: 0.9rem;
+  word-break: break-word;
+  white-space: pre-wrap;
+}
+
+.error-modal-content .modal-actions {
+  display: flex;
+  justify-content: flex-end;
+  margin-top: 1.5rem;
 }
 
 /* Buttons */