fix(client): address PR #24 review — 5 critical bugs, 3 warnings, 8 suggestions

Critical:
- Protocol test assertions updated v6→v7 (test_protocol_v6.gd)
- Dialogue signal connections wired (option_selected→DialogueResponse,
  dialogue_dismissed→DialogueEnd sent to server via SimBridge)
- Consume-once race fixed: _consume_dialogue() checks is_dialogue_active()
  before re-showing; dialogue_id tracking prevents re-trigger during fade
- Dialogue box responsive: _update_layout() clamps width to MAX_WIDTH_PX
  (832px) or 65% viewport, height to 20% viewport (MAX_HEIGHT_RATIO)
- Auto-pause added: SimBridge.send_input(PAUSE) on dialogue open/close

Warnings:
- Test coverage: 16 new tests in test_protocol_v7.gd (pending_recognitions
  decode, current_dialogue, GameState, SimBridge mock data, insert colors)
- queue_redraw() optimization: early return when no entities and no pings
- Fixed 200px height → responsive 20% viewport via _update_layout()

Suggestions:
- WASD detection refactored to _WALK_AWAY_ACTIONS array loop
- Button colors reference Constants.INSERT_COLOR_TEXT/HOVER/ACTIVE
- Named constants: COLOR_TRANSITION_START, SILHOUETTE_APPEAR_THRESHOLD,
  SILHOUETTE_SIZE with explanatory comments
- Bounds check: MAX_PENDING_RECOGNITIONS=64 with truncation warning
- Mock dialogue sustained across ticks (not 1-tick flash)
- COLOR_PING coupling with cursor documented as intentional
- Consume helpers extracted: _consume_monologue(), _consume_dialogue()

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

client/scripts/autoloads/sim_bridge.gd

@@ -333,7 +333,8 @@ func _test_snapshot() -> Dictionary:
 		}
 
 	# v7: mock dialogue (#434, D-061) — triggered by Interact near NPC
-	# One-shot: dialogue data sent once on the trigger tick, not every frame
+	# Sustained: dialogue persists across ticks while _test_in_dialogue is true.
+	# Movement (walk-away) clears it. Client consume-once guards against re-show.
 	var dialogue: Variant = null
 	if _test_in_dialogue:
 		dialogue = {
@@ -345,7 +346,6 @@ func _test_snapshot() -> Dictionary:
 				"I'm looking for someone.",
 			],
 		}
-		_test_in_dialogue = false
 
 	# v7: mock pending_recognitions (#431, D-059/D-060) — cognitive delay fog entity
 	# Entity at (13, 12) in fog: starts as grey blob, transitions to recognized over 6 ticks.