Expend adds Elevate & Enhanced tiers, slashes ATM fees to zero on top plan

Consolidated dedicated support into unified 'Dedicated Expend expert + priority response times' in Enhanced plan [Previously: separate Account Manager and Customer Success Manager roles in Everything plan]

Entry plan renamed to Essential, maintaining £33.00 base price but updating per-user description format; Per-user pricing changed for monthly plans: Entry/Essential £11/£12 → Essential/Elevate/Enhanced £12/£15/£18; Elevate plan introduced at £39.00 for 3 users (+£13pm/user); Enhanced plan introduced at £48.00 for 3 users (+£16pm/user); FX fees reduced: Entry 2.5% → Essential 3%, but new 2% option with add-on for Enhanced; ATM withdrawal fees reduced: Entry £2/£3 → Essential £2/£3, Elevate £1/£2, Enhanced free; Reimbursement fees improved: Entry 1.2% (max £1) → Essential Free, Elevate 0.9% (max £1), Enhanced 0% (free)