fix(web-frontend): Handle non-string values in InlineEdit.trim()

[sentry]

This PR addresses a TypeError: valueToDisplay.trim is not a function occurring in InlineEdit.tsx.

Root Cause:
The InlineEdit component expected value and displayValue props to always be strings. However, when displaying Person.id from the backend, which can be an int | str, a numeric ID would be passed as a JavaScript number. If TableColumns rendered InlineEdit for item.id without a prefix, this number would flow directly to valueToDisplay, causing .trim() to fail.

Solution:

1. Widened Prop Types: Updated InlineEditProps to allow value and displayValue to be string | number | null | undefined.
2. Safe String Coercion: Modified the calculation of valueToDisplay to String(displayValue ?? value ?? '') to ensure .trim() is always called on a string.
3. Hardened Edit Mode: Applied similar string coercion to the defaultValue of the input field and within the handleSave function to prevent crashes when editing numeric values or potentially null/undefined descriptions.

Fixes NURSE-SCHEDULING-7