feat(FN-1450): Add companies.sh catalog browse mode for agent import

- Add backend API routes for companies.sh catalog with pagination and search
- Wire frontend API client with browse mode endpoints (search, list agents)
- Build Agent Import modal with tabbed interface (URL input + browse mode)
- Add browse mode styling with search results grid and agent cards
- Include UI and route test coverage for browse flow
- Update in-UI help text with browse mode usage instructions

packages/dashboard/app/styles.css

@@ -25264,6 +25264,163 @@ html .column.drag-over * {
   border-radius: var(--radius-sm);
 }
 
+/* Agent Import Browse Mode */
+.agent-import-browse {
+  margin-bottom: var(--space-md);
+}
+
+.agent-import-browse-header {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-sm);
+  margin-bottom: var(--space-md);
+}
+
+.agent-import-browse-search {
+  position: relative;
+  display: flex;
+  align-items: center;
+}
+
+.agent-import-browse-search-icon {
+  position: absolute;
+  left: var(--space-sm);
+  color: var(--text-muted);
+  pointer-events: none;
+}
+
+.agent-import-browse-search-input {
+  width: 100%;
+  padding: var(--space-sm) var(--space-sm) var(--space-sm) calc(var(--space-sm) + 20px);
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  background: var(--surface-elevated);
+  color: var(--text);
+  font-size: 14px;
+}
+
+.agent-import-browse-search-input:focus {
+  outline: none;
+  border-color: var(--accent);
+}
+
+.agent-import-browse-selected {
+  display: flex;
+  align-items: center;
+  gap: var(--space-sm);
+  padding: var(--space-sm);
+  background: color-mix(in srgb, var(--accent) 10%, transparent);
+  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
+  border-radius: var(--radius);
+}
+
+.agent-import-browse-selected-label {
+  color: var(--text-muted);
+  font-size: 12px;
+}
+
+.agent-import-browse-selected-name {
+  flex: 1;
+  font-weight: 500;
+  color: var(--accent);
+}
+
+.agent-import-browse-loading {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: var(--space-sm);
+  padding: var(--space-xl) 0;
+  color: var(--text-muted);
+}
+
+.agent-import-browse-error {
+  display: flex;
+  align-items: center;
+  gap: var(--space-sm);
+  padding: var(--space-md);
+  background: color-mix(in srgb, var(--state-error-text) 8%, transparent);
+  border-radius: var(--radius);
+  color: var(--state-error-text);
+  font-size: 13px;
+}
+
+.agent-import-browse-list {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-xs);
+  max-height: 300px;
+  overflow-y: auto;
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  background: var(--surface);
+}
+
+.agent-import-browse-item {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+  padding: var(--space-sm);
+  cursor: pointer;
+  border-bottom: 1px solid var(--border);
+  transition: background-color 0.15s ease;
+}
+
+.agent-import-browse-item:last-child {
+  border-bottom: none;
+}
+
+.agent-import-browse-item:hover {
+  background: var(--surface-hover);
+}
+
+.agent-import-browse-item:focus {
+  outline: none;
+  background: var(--surface-hover);
+}
+
+.agent-import-browse-item--selected {
+  background: color-mix(in srgb, var(--accent) 10%, transparent);
+  border-color: var(--accent);
+}
+
+.agent-import-browse-item-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: var(--space-sm);
+}
+
+.agent-import-browse-item-name {
+  font-weight: 500;
+  color: var(--text);
+}
+
+.agent-import-browse-item-installs {
+  font-size: 11px;
+  color: var(--text-muted);
+  white-space: nowrap;
+}
+
+.agent-import-browse-item-tagline {
+  font-size: 12px;
+  color: var(--text-muted);
+  line-height: 1.4;
+}
+
+.agent-import-browse-item-repo {
+  font-size: 11px;
+  color: var(--text-muted);
+  font-family: monospace;
+}
+
+.agent-import-browse-empty {
+  padding: var(--space-lg);
+  text-align: center;
+  color: var(--text-muted);
+  font-size: 13px;
+}
+
 /* Agent controls actions row */
 .agent-controls-actions {
   display: flex;
@@ -27042,6 +27199,10 @@ html .column.drag-over * {
     gap: var(--space-sm);
     align-items: center;
   }
+
+  .agent-import-browse-list {
+    max-height: 250px;
+  }
 }
 
 @media (max-width: 480px) {