Give listFeeds its container: Add a feed loads its Popular list again

The dialog and the Directory/Popular pane both rendered into id="popular", and
listFeeds looked it up by id, so the dialog's list landed in the pane behind it.

Fixes #1

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SZbKERNSt4vQfyGV8rvkqp

.claude/settings.local.json

@@ -0,0 +1,14 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(rtk grep *)",
+      "Bash(rtk read *)",
+      "Bash(rtk git *)"
+    ],
+    "additionalDirectories": [
+      "/config/.claude/skills/security-audit",
+      "/config/security-audit-skill",
+      "/config/.cargo/registry"
+    ]
+  }
+}