[4/7] Remove `t` Prop Drilling in Recurrence and Shared EventForm Components

[kushu30]

Context

As part of the repository-wide translation compliance cleanup (post #7364), this batch focuses on Recurrence-related and EventForm shared components that are currently passing t as a prop instead of calling useTranslation() locally.

These components are reused across multiple screens, so refactoring must be done carefully to avoid regressions.

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Affected Files

• src/shared-components/EventForm/EventForm.tsx
• src/shared-components/EventForm/RecurrenceDropdown/RecurrenceDropdown.tsx
• src/shared-components/EventForm/utils/recurrenceOptions.ts
• src/shared-components/Recurrence/CustomRecurrenceModal.tsx
• src/shared-components/Recurrence/RecurrenceEndOptionsSection.tsx
• src/shared-components/Recurrence/RecurrenceFrequencySection.tsx
• src/shared-components/Recurrence/RecurrenceMonthlySection.tsx
• src/shared-components/Recurrence/RecurrenceWeeklySection.tsx
• src/shared-components/Recurrence/RecurrenceYearlySection.tsx

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Required Refactor

For each affected file:

• Remove t from props and parameters
• Eliminate any t prop drilling chains
• Import useTranslation from react-i18next
• Call const { t } = useTranslation() locally
• Ensure correct namespace usage
• Update related tests and mocks where necessary

No UI, recurrence logic, or form behavior should change as part of this refactor.

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Acceptance Criteria

• No component in this batch receives t as a prop
• All translation calls originate from local useTranslation()
• Recurrence logic remains functionally identical
• Tests pass without regression or flakiness
• Translation lint checks pass in CI
• Changes are strictly limited to Recurrence and EventForm domain