fix: show auto-compression elapsed time

tests/test_auto_compression_card.py

@@ -67,6 +67,48 @@ def test_auto_compression_completion_transition_is_preserved_after_running_liste
     assert "phase:'done'" in _compressed_listener_block()
 
 
+def test_auto_compression_running_sse_stamps_elapsed_timer_start():
+    block = _compressing_listener_block()
+
+    assert "startedAt:Date.now()/1000" in block
+    assert block.index("startedAt:Date.now()/1000") < block.index("setCompressionUi(state)")
+
+
+def test_auto_compression_running_card_renders_elapsed_timer_and_caps_updates():
+    src = _read("static/ui.js")
+    start = src.find("function _autoCompressionPreviewText")
+    assert start != -1, "auto compression preview helper not found"
+    end = src.find("function _compressionCardsNode", start)
+    assert end != -1, "compression cards node helper not found after auto helper"
+    helper = src[start:end]
+
+    assert "const _COMPRESSION_ELAPSED_MAX_SECONDS=5*60;" in src
+    assert "function _compressionElapsedLabel(state)" in src
+    assert "_formatActiveElapsedTimer" in src
+    assert "_compressionElapsedLabel(state)" in helper
+    assert "elapsedLabel" in helper
+    assert "_autoCompressionPreviewText(state)" in helper
+    assert "_autoCompressionDetailText(state)" in helper
+    assert "function _startCompressionElapsedTimer()" in src
+    assert "function _clearCompressionElapsedTimer()" in src
+    assert "function _updateCompressionElapsedCards(state)" in src
+    assert "_startCompressionElapsedTimer();" in src
+    assert "_clearCompressionElapsedTimer();" in src
+
+
+def test_auto_compression_live_card_keeps_elapsed_state_for_timer_refresh():
+    src = _read("static/ui.js")
+    start = src.find("function appendLiveCompressionCard")
+    assert start != -1, "live compression card append helper not found"
+    end = src.find("function _isHandoffSummaryToolPayload", start)
+    assert end != -1, "handoff helper not found after live compression helper"
+    helper = src[start:end]
+
+    assert "data-compression-started-at" in helper
+    assert "data-compression-message" in helper
+    assert "_compressionLiveCardState" in src
+
+
 def test_auto_compression_does_not_rerender_over_live_answer_text():
     block = _compressing_listener_block()
     src = _read("static/ui.js")