SDK-5762: Push template UI improvements and timer state persistence

[reshab-code]

Summary

• Fix left padding for title and message labels across all push templates (consistent horizontal inset)
• Fix top-left padding for title and subtitle in the rating template
• Add scrim overlay to the zero bezel template to improve text legibility over images
• Persist timer state across notification expand/collapse so the countdown doesn't reset on re-open

[francispereira]

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