More chat icons; message menu inside the bubble

- 18 more icons (gamepad, computer, food, ...) with a test that keeps the
  server whitelist and the client picker identical.
- The ⋯ menu of a message moves into the bubble foot (next to the time); its
  popup opens upwards inside the bubble and is limited to the bubble's width.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

core/src/types.rs

@@ -205,6 +205,7 @@ pub const SESSION_COLORS: &[&str] = &["red", "orange", "yellow", "green", "aqua"
 pub const SESSION_ICONS: &[&str] = &[
     "robot", "brain", "terminal", "wrench", "gear", "chart", "shield", "image", "music", "cube", "file-text", "folder", "search", "sparkle", "clock", "lock",
     "users", "toolbox", "plug", "scroll", "eye", "template",
+    "gamepad", "computer", "food", "coffee", "home", "book", "code", "camera", "cart", "heart", "star", "globe", "calendar", "car", "plane", "bulb", "money", "palette",
 ];
 
 impl Session {
@@ -299,3 +300,23 @@ pub fn new_id() -> String {
 pub fn now_ms() -> i64 {
     chrono::Utc::now().timestamp_millis()
 }
+
+#[cfg(test)]
+mod icon_tests {
+    use super::*;
+
+    /// The client's picker (ColorSwatches.tsx) and the server's whitelist must list the same names.
+    #[test]
+    fn session_icons_match_the_client() {
+        let ts = include_str!("../../web/src/components/ColorSwatches.tsx");
+        let list = ts.split("SESSION_ICONS = [").nth(1).and_then(|r| r.split("] as const").next()).expect("icon list in ColorSwatches.tsx");
+        let mut client: Vec<&str> = list.split('"').skip(1).step_by(2).collect();
+        let mut server: Vec<&str> = SESSION_ICONS.to_vec();
+        client.sort();
+        server.sort();
+        assert_eq!(client, server);
+        let mut dedup = server.clone();
+        dedup.dedup();
+        assert_eq!(dedup.len(), server.len(), "duplicate icon names");
+    }
+}