Persist designer media preset across sessions

[AlexNly]

Summary

• Save selected designer media preset to localStorage on change
• Restore saved preset on page load (if still a valid option)

Fixes #29

Test plan

• Open Designer tab, switch media to a non-default preset (e.g., 55x30 label)
• Reload the page — designer should open with the same preset selected
• Clear localStorage — should fall back to server default

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Guard localStorage access for blocked storage

Accessing localStorage can throw a SecurityError in environments where storage is blocked or disabled (e.g., Safari private mode, strict privacy settings). This new read runs during initialization, so a thrown error would abort the designer setup and leave the page unusable in those contexts. Consider wrapping the access in a try/catch or feature-checking storage availability before reading.

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