[Enhancement] Add custom preset saving with local persistence

[magic-peach]

Overview

Allow users to save their custom dimension settings as named presets that persist in localStorage, so they don't have to re-enter dimensions every time.

Implementation

Add 'Save as Preset' button in custom preset section. Store presets in localStorage as JSON array. Show saved presets alongside built-in presets.

Acceptance Criteria

• 'Save preset' button when Custom is selected
• Name input for the preset
• Saved presets appear in preset grid
• Ability to delete saved presets

[aksharsawhney74-rgb]

Hi @magic-peach ,

I would love to work on this performance optimization issue for GSSoC '26!
Could you please assign this to me?

Thanks,
Akshar

[magic-peach]

@aksharsawhney74-rgb please star the repo

[magic-peach]

Hey @aksharsawhney74-rgb! 👋

Thanks for being part of the Reframe community — your engagement on this issue means a lot! 🙌

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