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Task: Task: Complete the Session Conflict UI in coachs-site.php.

Requirements:

Coaches Input: Update the session form to replace the single coach text input with a multi-select dropdown that pulls from users where type-coach = 1.

Location Picker: Integrate a Google Places Autocomplete search. On selection, check the locations table: if the google_place_id exists, use that id; if not, create a new entry in the locations table and return the new id.

Validation Call: On form submission, hit /api/sessions/validate.php with the array of selected coach IDs.

Hard Warning Modal: If the API returns warnings, display a modal listing all conflicts (Venue, Personnel, and Travel). Provide a button Override

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