feat(ui): color and acknowledge pinned log errors

Add independent AppLog message types and explicit Class 1/2 severity. Wrap and color log rows, pin Class 1 above Class 2, and let acknowledgement return entries to the current-launch timeline without changing file format or rotation.

Ref: https://logtape.org/manual/levels

Controls/index.md

@@ -20,8 +20,9 @@ See [`schema.md`](../schema.md) for the memory-map conventions.
 The Add Layer menu exposes one standalone recent-alert Ticker per scene. The
 properties panel edits its independent `Ticker` settings; Stream Alerts retains
 its separate current-event ticker controls. Outside edit mode, the left panel
-offers Live Chat first and Logs second; Logs shows this process's newest AppLog
-entries first and excludes earlier file contents.
+offers Live Chat first and Logs second; Logs wraps and colors typed entries,
+pins explicit Class 1/2 errors above the timeline until acknowledged, then
+returns them to the timeline; it excludes earlier file contents.
 
 ## Window ↔ control contract