Fix premature plus user prompt display

[idoshamun]

Changes

Describe what this PR does

• Fixes UI flicker for Plus users: Resolves an issue where the "This title could be cleaner..." prompt briefly appeared for Plus users on post page load.
• Introduces isPlusLoading state: The usePlusSubscription hook now includes an isPlusLoading state to indicate when the user's Plus subscription status is still being determined.
• Ensures correct rendering: PostClickbaitShield, ClickbaitShield, ToggleClickbaitShield, and UpgradeToPlus components now wait for isPlusLoading to resolve before rendering, preventing premature display of non-Plus specific UI elements.

Events

Experiment

Manual Testing

Caution

Please make sure existing components are not breaking/affected by this PR

On those affected packages:

• Have you done sanity checks in the webapp?
• Have you done sanity checks in the extension?
• Does this not break anything in companion?

Did you test the modified components media queries?

• MobileL (420px)
• Tablet (656px)
• Laptop (1020px)

Did you test on actual mobile devices?

• iOS (Chrome and Safari)
• Android

Specific testing steps:

1. As a Plus user: Load a post page and confirm no "This title could be cleaner..." prompt appears, even briefly.
2. As a non-Plus user: Confirm the "This title could be cleaner..." prompt still appears as expected.
3. Network throttling: Test with a slow network connection to ensure no flicker occurs during loading for either Plus or non-Plus users.

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Slack Thread

Preview domain

https://cursor-fix-premature-plus-user-p.preview.app.daily.dev

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