feat(client): add fog entity visualization and wire Sprint 7 UI (#431, #434)

Fog entity cognitive delay rendering (D-059/D-060): sonar-style sound
pings (3 concentric rings, 1.5s fade), unrecognized grey blobs with
breathing pulse, D-033 color transition at 50% recognition progress,
±0.5 tile position drift. FogEntities node at z:950 between fog
shader and InsertOverlay.

Protocol v7 bump to match server PR #23 (pending_recognitions field).
Wires dialogue box and fog entities into game loop with mock test data.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/scripts/main.gd

@@ -1,12 +1,14 @@
 extends Node2D
 
 @onready var world_renderer = $World
+@onready var fog_entities = $World/FogEntities  # D-059/D-060: cognitive delay fog visualization
 @onready var camera = $Camera2D
 @onready var hud = $UILayer/HUD
 @onready var monologue_display = $UILayer/MonologueDisplay
 @onready var interaction_prompt = $InsertOverlay/InteractionPrompt  # v0.1 single-line fallback
 @onready var interaction_list = $InsertOverlay/InteractionList  # D-057: z-layer 6
 @onready var world_radial = $InsertOverlay/WorldRadial  # D-058: z-layer 6
+@onready var dialogue_box = $InsertOverlay/DialogueBox  # D-061: z-layer 6
 @onready var inventory_grid = $UILayer/InventoryGrid  # D-065: z-layer 7
 @onready var stance_indicator = $UILayer/StanceIndicator  # D-053: z-layer 7
 @onready var cursor_renderer = $UILayer/CursorRenderer  # D-056: z-layer 7
@@ -39,6 +41,10 @@ func _process(_delta: float) -> void:
 		if stance_indicator and stance_indicator.has_method("update_from_state"):
 			stance_indicator.update_from_state()
 
+		# D-059/D-060: Update fog entity visualization (#431)
+		if fog_entities and fog_entities.has_method("update_from_state"):
+			fog_entities.update_from_state()
+
 		# Show monologue if server sent one this tick (#414)
 		# Consume-once: set to null after showing to prevent re-display.
 		# Single monologue per snapshot is guaranteed by server.
@@ -47,6 +53,16 @@ func _process(_delta: float) -> void:
 			monologue_display.show_monologue(mono.get("text", ""), mono.get("duration_seconds", 5.0))
 			GameState.current_monologue = null
 
+		# D-061: Show dialogue if server sent one this tick (#434)
+		if GameState.current_dialogue != null and dialogue_box:
+			var dlg: Dictionary = GameState.current_dialogue
+			dialogue_box.show_dialogue(
+				dlg.get("npc_name", ""),
+				dlg.get("speech", ""),
+				dlg.get("options", [])
+			)
+			GameState.current_dialogue = null
+
 	# Track camera to player position every frame (D-015: locked, no panning)
 	# Camera2D smoothing handles interpolation — we just set the target
 	camera.global_position = GameState.player_position * Constants.TILE_SIZE