Chat bubbles, icons for chats, more vivid and distinct colour tags

- Bubbles: own messages right-aligned in their own colour, agent answers left.
- Chat icons (22, validated on the server), shown in list, top bar, project page.
- Colour tags: eight fixed hues (new: pink) with theme-matched lightness and the
  highest chroma sRGB allows; stronger background tint.

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

server/src/api.rs

@@ -647,6 +647,7 @@ async fn create_session(Extension(user): Extension<User>, State(app): State<AppS
         telegram_quiet: true,
         summary: String::new(),
         color: dstr("color").filter(|c| codecraft_core::types::SESSION_COLORS.contains(&c.as_str())),
+        icon: dstr("icon").filter(|c| codecraft_core::types::SESSION_ICONS.contains(&c.as_str())),
     };
     let s = app.save_session(s)?;
     Ok(Json(json!(s)))
@@ -942,6 +943,8 @@ struct UpdateSession {
     telegram_quiet: Option<bool>,
     /// Colour tag ("" removes it).
     color: Option<String>,
+    /// Icon ("" removes it).
+    icon: Option<String>,
 }
 
 async fn update_session(Extension(user): Extension<User>, State(app): State<AppState>, Path(id): Path<String>, Json(body): Json<UpdateSession>) -> ApiResult {
@@ -957,6 +960,9 @@ async fn update_session(Extension(user): Extension<User>, State(app): State<AppS
     if body.color.as_deref().is_some_and(|c| !c.is_empty() && !codecraft_core::types::SESSION_COLORS.contains(&c)) {
         return Err(ApiError(StatusCode::BAD_REQUEST, "invalid colour".into()));
     }
+    if body.icon.as_deref().is_some_and(|c| !c.is_empty() && !codecraft_core::types::SESSION_ICONS.contains(&c)) {
+        return Err(ApiError(StatusCode::BAD_REQUEST, "invalid icon".into()));
+    }
     if body.permission_mode.as_deref().is_some_and(|p| !crate::permission::MODES.contains(&p)) {
         return Err(ApiError(StatusCode::BAD_REQUEST, "invalid permission mode".into()));
     }
@@ -999,6 +1005,9 @@ async fn update_session(Extension(user): Extension<User>, State(app): State<AppS
         if let Some(c) = body.color {
             s.color = (!c.is_empty()).then_some(c);
         }
+        if let Some(i) = body.icon {
+            s.icon = (!i.is_empty()).then_some(i);
+        }
     })?;
     Ok(Json(json!(s)))
 }
@@ -1454,7 +1463,7 @@ async fn put_project_defaults(Extension(user): Extension<User>, State(app): Stat
     let s = writable(&app, &user, &id)?;
     let data = json!({
         "model": s.model, "agent": s.agent, "permission_mode": s.permission_mode,
-        "color": s.color, "instructions": s.instructions, "folder": s.folder,
+        "color": s.color, "icon": s.icon, "instructions": s.instructions, "folder": s.folder,
     });
     app.store.set_project_defaults(&s.cwd, Some(&data))?;
     Ok(Json(data))
@@ -2145,6 +2154,7 @@ async fn job_assistant(Extension(user): Extension<User>, State(app): State<AppSt
         telegram_quiet: true,
         summary: String::new(),
         color: None,
+        icon: None,
     };
     let s = app.save_session(s)?;
     st.assistant_session = Some(s.id.clone());

server/src/jobs.rs

@@ -323,6 +323,7 @@ pub async fn run_with(app: &Arc<App>, job: &Job, trigger: &str, payload: Option<
         telegram_quiet: true,
         summary: String::new(),
         color: None,
+        icon: None,
     };
     let session = app.save_session(session)?;
     app.store.job_started(&job.id, &session.id, now)?;

server/src/runner.rs

@@ -899,6 +899,7 @@ fn create_child(app: &Arc<App>, ctx: &ToolCtx, agent_name: &str, description: &s
         telegram_quiet: false,
         summary: String::new(),
         color: None,
+        icon: None,
     };
     let child = app.save_session(child)?;
     let msg = Message::new(Role::User, vec![Part::Text { text: prompt }]);

server/src/telegram.rs

@@ -543,6 +543,7 @@ async fn new_session(app: &Arc<App>, u: &User, bot: &Bot, chat: i64, arg: &str,
         telegram_quiet: false,
         summary: String::new(),
         color: None,
+        icon: None,
     })?;
     update(app, &u.id, |st| st.session = Some(s.id.clone()));
     bot.send(chat, &format!("{} <b>{}</b> · {} · {}", tr(de, "Neue Sitzung", "New session"), esc(&s.cwd), esc(&s.agent), esc(&s.model)), None).await?;