Fix: iOS/Safari date parsing RangeError

[sentry]

This PR addresses a RangeError: Invalid time value occurring on iOS/WebKit browsers when dateTimeFormat() attempts to format date strings. The root cause was that dateTimeFormat() was passing raw dash-delimited date strings (e.g., 'YYYY-MM-DD') directly to date-fns format(). Internally, date-fns uses new Date(), which on iOS/WebKit, cannot reliably parse dash-delimited strings, leading to the error.

The fix involves wrapping the value parameter with the existing toDate() helper function within dateTimeFormat(). The toDate() function correctly converts dash-delimited strings to a Safari-compatible format (replacing dashes with slashes) before they are passed to date-fns format(). This ensures that dates are parsed correctly across all browsers, resolving the crash on iOS devices.

Fixes SH-STUDENT-APP-W
Fixes TECH-2019

[linear-code]

TECH-2019

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[sentry]

Bug: The toDate() function incorrectly replaces all dashes with slashes, corrupting ISO 8601 date strings. This causes new Date() to return Invalid Date, leading to a crash.
_{Severity: CRITICAL}

Suggested Fix

Modify the toDate() function to correctly handle ISO 8601 datetime strings. Instead of globally replacing dashes with slashes, pass the ISO string directly to new Date(), as it can parse this format natively. Remove the replace(/-/g, '/') call.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: src/utils/common.ts#L19

Potential issue: The `toDate()` function at `src/utils/common.ts:19` uses
`date.replace(/-/g, '/')` to format date strings. This logic incorrectly transforms full
ISO 8601 datetime strings (e.g., from `date.toISOString()`) into an invalid format like
`2024/01/15T10:30:00.000Z`. When this invalid string is passed to `new Date()`, it
returns `Invalid Date`. This value is then used by `date-fns format()`, which throws a
`RangeError: Invalid time value`, leading to an application crash. This affects multiple
components that pass ISO strings to `dateTimeFormat`, such as `date-dropdown.tsx` and
`form-datetime.tsx`.

Also affects:

• date-dropdown.tsx:35
• form-datetime.tsx:59

_{Did we get this right? 👍 / 👎 to inform future reviews.}