fix(zustand): use v5-compatible equality hook

[Adarsh9977]

What does this PR do?

• Replaces deprecated Zustand useStore equality function usage with useStoreWithEqualityFn from zustand/traditional.
• Keeps custom equality selector behavior intact for booking actions, Booker, and weekly calendar store contexts.
• Updates the affected store provider imports for Zustand v5 compatibility.

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A visual demonstration is strongly recommended, for both the original and new change (video / image - any one).

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Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

• Are there environment variables that should be set?
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[github-actions]

Welcome to Cal.diy, @Adarsh9977! Thanks for opening this pull request.

A few things to keep in mind:

• This is Cal.diy, not Cal.com. Cal.diy is a community-driven, fully open-source fork of Cal.com licensed under MIT. Your changes here will be part of Cal.diy — they will not be deployed to the Cal.com production app.
• Please review our Contributing Guidelines if you haven't already.
• Make sure your PR title follows the Conventional Commits format.

A maintainer will review your PR soon. Thanks for contributing!

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: d1ca78e2-4b98-4387-a853-95c53fb9456c

📥 Commits

Reviewing files that changed from the base of the PR and between f004349 and 9620340.

📒 Files selected for processing (3)

• apps/web/components/booking/actions/BookingActionsStoreProvider.tsx
• packages/features/bookings/Booker/BookerStoreProvider.tsx
• packages/features/calendars/weeklyview/state/store.ts

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📝 Walkthrough

Walkthrough

Updated booking actions, Booker, and weekly calendar Zustand integrations to use useStoreWithEqualityFn instead of useStore. Existing selectors and optional equality functions remain part of the store hook interfaces, and the Booker initialization selector now uses the same equality-aware subscription mechanism.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: migrating Zustand usage to the v5-compatible equality hook.
Description check	✅ Passed	The description matches the code changes and objectives, describing the switch to useStoreWithEqualityFn across the affected providers.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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