Harden UI layout for font scale and long strings

- Measure and cap the HUD target chip after each font-scale change; clip HUD top labels.
- Ellipsize long action-button labels so panels cannot grow past the viewport.
- Add accessibility/button layout assertions and refresh the gallery captures.
- Record the font/layout pass in TODO, docs, changelog and memory.

src/test/tests/test_accessibility.gd

@@ -49,8 +49,18 @@ func test_font_scale_applies_to_core_labels() -> bool:
 	hud.set_font_scale(9.0)
 	var capped: int = hud.top_label.get_theme_font_size("font_size")
 	var f := TestUtils.check(capped <= int(round(float(base_top) * 1.75)) + 1, "scale clamps at 1.75")
+	# The target chip must widen with the scaled font instead of spilling over
+	# the world; an extreme name is capped rather than pushing off-screen.
+	hud.set_font_scale(1.75)
+	hud.set_target_label("Intoxicated Pedestrian")
+	var chip = hud.get("_target_chip")
+	var chip_width: float = float(chip.offset_right) - float(chip.offset_left)
+	var g := TestUtils.check(chip_width > 300.0, "target chip widens at max font scale")
+	hud.set_target_label("An Extraordinarily Long Display Name For A Visitor In A Pseudo Locale")
+	var long_width: float = float(chip.offset_right) - float(chip.offset_left)
+	var h := TestUtils.check(long_width <= 420.5, "target chip caps an extreme name")
 	hud.free()
-	return a and b and c and d and e and f
+	return a and b and c and d and e and f and g and h
 
 func test_settings_font_scale_is_applied_after_ui_exists() -> bool:
 	## The HUD is created after settings load, so the manager must re-apply.