fix(client): address PR review round 2 — camera tracking, minimap, monologue wiring

- Camera2D now tracks player_position from GameState (D-015)
- Add SubViewport child to minimap SubViewportContainer (fixes editor warning)
- Wire MonologueDisplay into main loop for D-016 perception data path

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

client/ui/minimap.tscn

@@ -21,12 +21,14 @@ anchor_bottom = 1.0
 grow_horizontal = 2
 grow_vertical = 2
 
-[node name="Background" type="ColorRect" parent="SubViewportContainer"]
+[node name="SubViewport" type="SubViewport" parent="SubViewportContainer"]
+size = Vector2i(200, 200)
+render_target_update_mode = 4
+
+[node name="Background" type="ColorRect" parent="SubViewportContainer/SubViewport"]
 anchors_preset = 15
 anchor_right = 1.0
 anchor_bottom = 1.0
-offset_right = 200.0
-offset_bottom = 200.0
 grow_horizontal = 2
 grow_vertical = 2
 color = Color(0.1, 0.1, 0.1, 0.7)