rename header title and subtitle

[MoMannn]

Description

Replace header and sub header with more meaningful text.

Manual testing steps

1. Go to http://localhost:8000/
2. Grant permission

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask 7715 Permissions Snaps Contributor Docs and MetaMask 7715 Permissions Snaps Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

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Note

Renames snap display name and permission titles to simpler labels: "Permission Request", "Token Subscription", and "Token Stream".

• UI labels:
  • Snap manifest: Update packages/gator-permissions-snap/snap.manifest.ts proposedName to "Permission Request".
  • Permissions:
    • erc20TokenPeriodic: title → "Token Subscription".
    • nativeTokenPeriodic: title → "Token Subscription".
    • erc20TokenStream: title → "Token Stream".
    • nativeTokenStream: title → "Token Stream".

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