ui: avoid unnecessary text cache invalidation in UnifiedLabel

[deanlee]

UnifiedLabel setters now skip updates when values haven't changed, avoiding unnecessary cache invalidation and text re-layout.

These setters are frequently called from render loops (e.g.,

openpilot/selfdrive/ui/mici/onroad/alert_renderer.py

Lines 325 to 329 in d0c3972

	self._alert_text1_label.set_text(alert_text1)
	self._alert_text1_label.set_text_color(color)
	self._alert_text1_label.set_font_size(font_size)
	self._alert_text1_label.set_alignment(rl.GuiTextAlignment.TEXT_ALIGN_LEFT if icon_side != 'left' else rl.GuiTextAlignment.TEXT_ALIGN_RIGHT)
	self._alert_text1_label.render(text_rect1)

), which previously forced a full text re-layout every frame. This change removes that overhead and improves render efficiency.

[github-actions]

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