## Context
Replaces all usage of `form.watch()` to use `useWatch` instead + follows
the "name what you watch" convention as specified in the react-hook-form
skills.
There's also a small refactor in `SmtpForm.tsx` which removes the
unnecessary use of a `useState` to track if SMTP is enabled or not
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## Summary by CodeRabbit
* **Improvements**
* Updated many Studio forms to watch specific fields more precisely,
improving live UI updates for previews, warnings, conditional sections,
and validation messages.
* Enhanced responsiveness across settings, authentication, billing,
storage, integrations, and support flows while keeping save/update
behavior the same.
* **Refined Experiences**
* Improved the analytics table creation flow with tighter, enum-based
column type validation and structured, type-specific column options.
* **Preserved Behavior**
* Maintained existing permission checks, submission flows, and
account-management workflows.
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## Problem
We used to have a `_Shadcn_` suffix for all the shadcn form components
because we also had `formik` form components.
This is not needed anymore.
## Solution
- Remove the suffix
- Update all usages
Joshen Lim