fix(client): resolve all gdlint warnings — zero warnings policy

Fix 354 gdlint warnings across 65 files: 194 class-definitions-order
(reorder declarations), 138 max-line-length (split long lines),
22 code issues (unused args, no-else-return, naming). Update .gdlintrc
to exclude addons/ and raise max-public-methods for test files.
No logic changes — declaration order, whitespace, and naming only.

Ticket: #783

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

client/tests/test_insert_off_behavior.gd

@@ -44,7 +44,7 @@ func _make_cursor_or_skip() -> Node:
 
 func _make_interaction_list() -> Node:
 	for path in ["res://ui/interaction_list.tscn", "res://ui/entity_interaction_list.tscn",
-				  "res://scenes/interaction_list.tscn"]:
+			"res://scenes/interaction_list.tscn"]:
 		if ResourceLoader.exists(path):
 			var scene = load(path)
 			var node = scene.instantiate()