diff --git a/client/scripts/rendering/sound_indicator_renderer.gd b/client/scripts/rendering/sound_indicator_renderer.gd
index ab54be5d1..6dc0864ef 100644
--- a/client/scripts/rendering/sound_indicator_renderer.gd
+++ b/client/scripts/rendering/sound_indicator_renderer.gd
@@ -13,8 +13,9 @@ extends Node2D
 ##   Danger   #d45d5d — alert, gunshot, explosion, threat
 ##
 ## Each indicator lives for INDICATOR_LIFETIME seconds and fades out over
-## the last FADE_DURATION seconds. New events from the same tick replace
-## any previously received events (server sends current medium events per tick).
+## the last FADE_DURATION seconds. New events are appended each tick;
+## expired indicators are removed by _process(). Deduplication prevents
+## the same source position from stacking multiple arrows.
 
 const TILE_SIZE: int = Constants.TILE_SIZE
 
@@ -47,20 +48,32 @@ func _process(delta: float) -> void:
 	queue_redraw()
 
 
-## Update medium-range sound events from snapshot.
+## Append new medium-range sound events from snapshot.
 ## events: Array of {x: float, y: float, event_type: String}
 ## Only Medium range_category events should be passed.
+## Deduplicates by tile position — if an indicator already exists at (x,y),
+## its timer resets instead of spawning a duplicate arrow.
 func update_sound_events(events: Array) -> void:
-	_indicators.clear()
 	for evt in events:
 		if not evt.has("x") or not evt.has("y"):
 			continue
-		_indicators.append({
-			"x": float(evt.x),
-			"y": float(evt.y),
-			"event_type": evt.get("event_type", ""),
-			"elapsed": 0.0,
-		})
+		var ex: float = float(evt.x)
+		var ey: float = float(evt.y)
+		# Deduplicate: reset timer if an indicator already exists at this tile
+		var found := false
+		for ind in _indicators:
+			if is_equal_approx(ind.x, ex) and is_equal_approx(ind.y, ey):
+				ind.elapsed = 0.0
+				ind.event_type = evt.get("event_type", "")
+				found = true
+				break
+		if not found:
+			_indicators.append({
+				"x": ex,
+				"y": ey,
+				"event_type": evt.get("event_type", ""),
+				"elapsed": 0.0,
+			})
 	if not _indicators.is_empty():
 		queue_redraw()
 
@@ -122,7 +135,7 @@ func _rect_edge_point(center: Vector2, dir: Vector2, half: Vector2, inset: float
 func _draw_arrow(pos: Vector2, dir: Vector2, color: Color) -> void:
 	var perp := Vector2(-dir.y, dir.x)
 	var base_center := pos - dir * ARROW_LEN
-	draw_colored_polygon(
+	draw_polygon(
 		PackedVector2Array([pos, base_center - perp * ARROW_HALF, base_center + perp * ARROW_HALF]),
 		PackedColorArray([color, color, color])
 	)
diff --git a/client/tests/test_rendering.gd b/client/tests/test_rendering.gd
index 087068859..4e4a760fe 100644
--- a/client/tests/test_rendering.gd
+++ b/client/tests/test_rendering.gd
@@ -438,24 +438,25 @@ func test_sound_indicator_drops_events_without_position() -> void:
 	assert_that(renderer._indicators.size()).is_equal(1)
 	renderer.queue_free()
 
-func test_sound_indicator_replaces_events_on_update() -> void:
+func test_sound_indicator_appends_new_events() -> void:
 	var renderer := _make_sound_indicator_renderer()
 	renderer.update_sound_events([
 		{"x": 1.0, "y": 1.0, "event_type": "Voice"},
 		{"x": 2.0, "y": 2.0, "event_type": "Footstep"},
 	])
 	assert_that(renderer._indicators.size()).is_equal(2)
-	# New update replaces all previous events
+	# New update appends — existing indicators persist until they expire
 	renderer.update_sound_events([{"x": 5.0, "y": 5.0, "event_type": "Footstep"}])
-	assert_that(renderer._indicators.size()).is_equal(1)
+	assert_that(renderer._indicators.size()).is_equal(3)
 	renderer.queue_free()
 
-func test_sound_indicator_empty_update_clears_indicators() -> void:
+func test_sound_indicator_empty_update_preserves_existing() -> void:
 	var renderer := _make_sound_indicator_renderer()
 	renderer.update_sound_events([{"x": 3.0, "y": 3.0, "event_type": "Voice"}])
 	assert_that(renderer._indicators.size()).is_equal(1)
+	# Empty update does not clear existing indicators — they expire via _process
 	renderer.update_sound_events([])
-	assert_that(renderer._indicators.size()).is_equal(0)
+	assert_that(renderer._indicators.size()).is_equal(1)
 	renderer.queue_free()
 
 func test_sound_indicator_color_voice() -> void:
@@ -479,6 +480,15 @@ func test_sound_indicator_color_neutral_for_unknown() -> void:
 	assert_that(renderer._color_for_type("Unknown")).is_equal(SoundIndicatorRenderer.COLOR_NEUTRAL)
 	renderer.queue_free()
 
+func test_sound_indicator_deduplicates_same_position() -> void:
+	var renderer := _make_sound_indicator_renderer()
+	renderer.update_sound_events([{"x": 5.0, "y": 5.0, "event_type": "Voice"}])
+	assert_that(renderer._indicators.size()).is_equal(1)
+	# Same position again — should reset timer, not add a duplicate
+	renderer.update_sound_events([{"x": 5.0, "y": 5.0, "event_type": "Voice"}])
+	assert_that(renderer._indicators.size()).is_equal(1)
+	renderer.queue_free()
+
 func test_sound_indicator_elapsed_starts_at_zero() -> void:
 	var renderer := _make_sound_indicator_renderer()
 	renderer.update_sound_events([{"x": 10.0, "y": 5.0, "event_type": "Voice"}])
diff --git a/client/tests/test_sound_indicators.gd b/client/tests/test_sound_indicators.gd
index 1aebb88c1..e9abcc6e8 100644
--- a/client/tests/test_sound_indicators.gd
+++ b/client/tests/test_sound_indicators.gd
@@ -200,9 +200,25 @@ func test_indicator_does_not_crash_for_empty_events() -> void:
 	indicator.set_script(script)
 	add_child(indicator)
 	indicator.update_sound_events([])
+	# Empty update on fresh renderer — no indicators exist, no crash
 	assert_that(indicator._indicators.size()).is_equal(0)
 	indicator.queue_free()
 
+func test_indicator_existing_survive_empty_update() -> void:
+	## Existing indicators persist through an empty update (expire via _process only).
+	var script: GDScript = _load_indicator_script()
+	if script == null:
+		push_warning("TestSoundIndicators: sound_indicator_renderer.gd not found")
+		return
+	var indicator := Node2D.new()
+	indicator.set_script(script)
+	add_child(indicator)
+	indicator.update_sound_events([{"x": 5.0, "y": 5.0, "event_type": "Voice"}])
+	assert_that(indicator._indicators.size()).is_equal(1)
+	indicator.update_sound_events([])
+	assert_that(indicator._indicators.size()).is_equal(1)
+	indicator.queue_free()
+
 func test_indicator_stores_valid_medium_events() -> void:
 	## #126: update_sound_events must store events with x and y fields.
 	var script: GDScript = _load_indicator_script()
diff --git a/client/ui/dialogue_box.gd b/client/ui/dialogue_box.gd
index a0683983f..62c71b53b 100644
--- a/client/ui/dialogue_box.gd
+++ b/client/ui/dialogue_box.gd
@@ -28,7 +28,7 @@ const FADE_IN: float = 0.2
 const FADE_OUT: float = 0.3  # D-064: 300ms fade on walk-away
 const MAX_OPTIONS: int = 3   # D-061: max 3 response options visible
 const MAX_HEIGHT_RATIO: float = 0.2   # D-061: max 20% viewport height
-const MAX_WIDTH_PX: float = 832.0     # D-061: max-width cap (~65% of 1280)
+const MAX_WIDTH_PX: float = Constants.DIALOGUE_MAX_WIDTH  # D-076: 640px (OQ-29)
 const CONFRONTATION_BEAT_DURATION: float = 1.5  # D-063: pause before sending
 const CONFRONTATION_DIM_ALPHA: float = 0.7  # D-063: dialogue box dims during beat
 const CONFRONTATION_MONOLOGUE_KEY: String = "dialogue.confrontation_beat"
diff --git a/client/ui/dialogue_box.tscn b/client/ui/dialogue_box.tscn
index 9207b8bad..ac80c616e 100644
--- a/client/ui/dialogue_box.tscn
+++ b/client/ui/dialogue_box.tscn
@@ -20,9 +20,9 @@ anchor_left = 0.5
 anchor_top = 1.0
 anchor_right = 0.5
 anchor_bottom = 1.0
-offset_left = -416.0
+offset_left = -320.0
 offset_top = -200.0
-offset_right = 416.0
+offset_right = 320.0
 grow_horizontal = 2
 grow_vertical = 0
 
diff --git a/decisions/perception.md b/decisions/perception.md
index a6cc2e4d7..c4675ee4a 100644
--- a/decisions/perception.md
+++ b/decisions/perception.md
@@ -358,4 +358,4 @@ How the player observes and interacts with the world: camera, fog, line-of-sight
 
 ---
 
-*30 decisions. Last updated: 2026-02-19 (D-076: OQ-29 resolved — dialogue max-width 1920px)*
+*30 decisions. Last updated: 2026-02-19 (D-076: OQ-29 resolved — dialogue max-width 640px)*