Update: Progression Rebalance, Pet UI & Rendering Improvements — Evergarden Steam update #45729

Pet Upgrade Cost Balancing: Rebalanced all pet upgrade costs (both Unique and Speed upgrades) to scale dynamically based on each pet's unlock stage. The upgrade costs are now aligned with the expected progression economy model (using reinvested gold curves). Trait Tree Node Cost Balancing: Rebalanced Trait Tree node unlock costs (both Main and Sub-nodes) using the expected economy progression curves. This ensures that unlocking traits scales naturally and feels rewarding in relation to your actual progression stage. Improved Pet UI Layout: Fixed a UI layout issue where the "Equip" button was horizontally stretched and distorted when only one pet slot was active. The button now maintains its clean, original aspect ratio when single-equipped, while still dynamically stretching to split the space when multiple pet slots are unlocked. Fixed Flying Pet Rendering: Fixed a visual bug where flyi...