Single line address instead of textareas in UI

[anonymoususer72041]

Summary

• Replace textarea-based address fields with single-line <input> fields for candidates, contacts and companies in the main UI.
• Adjust the rendering of the <input-address> placeholder in CareersUI.php so that it expands to a single-line <input> instead of a textarea-like field. The careers portal templates stored in the database are not modified by this PR.

Motivation

• Address fields in the main UI and the careers portal are typically used as single-line inputs in practice, and treating them as textareas was inconsistent with other fields such as city, state or postal code.
• In the careers portal, the previous textarea-style address field could mislead applicants into thinking they should enter their entire postal address block (street, zip/postal code, city, country) into a single field because of its large, multiline appearance. A single-line input makes it clearer that only the street address line is expected, consistent with the surrounding fields.
• While working on this change I noticed some remaining legacy patterns around address1 / address2 / address3 and newline-based addresses (e.g. in old schema upgrade steps and in the contacts vCard export). These are not addressed in this PR.

[anonymoususer72041]

It looks like the fix for #356 (merged into develop via #526) never made it into master, so this Pull Request includes the missing id="address" behavior again.