fix(agent-ui): collapse repeated generic status ticks into one row

Claude's generic `system/status` subtype carries no detail beyond the
bare label, and previously each tick got its own note row. During a
compaction pass (which emits a burst of these with no other signal
before the completed compact_boundary) this looked like a wall of
identical noise followed by silence, making a routine compaction look
stuck.

Collapse consecutive status ticks into one updating row, same pattern
already used for the thinking_tokens counter.

frontend/packages/agent/src/app.js

@@ -1900,6 +1900,13 @@ window.marked = marked;
     // null), so any other event starts fresh.
     let thinkingTokensRow = null;
     let thinkingTokensText = null;
+    // Same coalescing trick for claude's generic `status` subtype (bare
+    // "still working" ticks with no detail beyond the label itself). Without
+    // this every tick got its own row, so a compaction (which emits a burst
+    // of these with no other signal) looked like a wall of identical noise
+    // rather than one "still going" line.
+    let statusRow = null;
+    let statusText = null;
     function renderStream(v, api) {
       // Drop claude's result line and rate-limit — noise. TurnEnd
       // communicates pass/fail; rate-limit events are noisy status chatter.
@@ -1994,6 +2001,23 @@ window.marked = marked;
           api.row('note', parts.join(' · '));
           return;
         }
+        // Bare `status` ticks (claude's own generic "still working" signal,
+        // no detail beyond the label) — collapse consecutive ticks into one
+        // updating row instead of a fresh note each, same pattern as
+        // `thinking_tokens` above. These are the only signal we get during a
+        // compaction pass (no dedicated "compacting…" event from claude), so
+        // without collapsing a compaction looked like a wall of identical
+        // `⚙ status` rows followed by silence.
+        if (v.subtype === 'status') {
+          const text = '⚙ status';
+          if (statusRow && statusRow.isConnected
+              && statusRow.nextElementSibling === null) {
+            statusText.nodeValue = text;
+          } else {
+            [statusRow, statusText] = api.mutableRow('note', text);
+          }
+          return;
+        }
         // Other system subtypes (context_window_exceeded, etc.) — render a
         // muted note with the subtype label; reserve the loud orange `sys`
         // catch-all for truly unrecognised top-level types.