feat(ui): session attention indicators — streaming spinner, unread dot, timestamps (#856)

Closes #856. Co-authored-by: Frank Song <138988108+franksong2702@users.noreply.github.com>
Reviewed-by: nesquena (709bd37 — test isolation fix also included)

tests/test_issue856_active_session_read_state.py

@@ -0,0 +1,49 @@
+"""Regression checks for #856 active-session unread state handling."""
+
+from pathlib import Path
+
+
+MESSAGES_JS = (Path(__file__).resolve().parent.parent / "static" / "messages.js").read_text()
+
+
+def test_messages_js_defines_active_session_viewed_helper():
+    assert "function _markSessionViewed(" in MESSAGES_JS, (
+        "messages.js should define a helper that marks the active session as viewed"
+    )
+    assert "_setSessionViewedCount" in MESSAGES_JS, (
+        "active-session viewed helper must delegate to the sidebar viewed-count store"
+    )
+
+
+def test_done_path_marks_active_session_as_viewed():
+    done_idx = MESSAGES_JS.find("source.addEventListener('done'")
+    assert done_idx != -1, "done handler not found in messages.js"
+    done_block = MESSAGES_JS[done_idx:MESSAGES_JS.find("source.addEventListener('stream_end'", done_idx)]
+    assert "_markSessionViewed(activeSid" in done_block, (
+        "done handler must mark the active session as viewed so unread dot does not linger"
+    )
+
+
+def test_cancel_path_marks_active_session_as_viewed():
+    cancel_idx = MESSAGES_JS.find("source.addEventListener('cancel'")
+    assert cancel_idx != -1, "cancel handler not found in messages.js"
+    cancel_block = MESSAGES_JS[cancel_idx:MESSAGES_JS.find("async function _restoreSettledSession()", cancel_idx)]
+    assert "_markSessionViewed(activeSid" in cancel_block, (
+        "cancel handler must mark the active session as viewed after settling messages"
+    )
+
+
+def test_restore_and_error_paths_mark_active_session_as_viewed():
+    restore_idx = MESSAGES_JS.find("async function _restoreSettledSession()")
+    assert restore_idx != -1, "_restoreSettledSession() not found in messages.js"
+    restore_block = MESSAGES_JS[restore_idx:MESSAGES_JS.find("function _handleStreamError()", restore_idx)]
+    assert "_markSessionViewed(activeSid" in restore_block, (
+        "_restoreSettledSession() must mark the active session as viewed"
+    )
+
+    error_idx = MESSAGES_JS.find("function _handleStreamError()")
+    assert error_idx != -1, "_handleStreamError() not found in messages.js"
+    error_block = MESSAGES_JS[error_idx:]
+    assert "_markSessionViewed(activeSid" in error_block, (
+        "_handleStreamError() must mark the active session as viewed"
+    )