v0.1.20

Added

• Dynamic tier filtering: Use E/D keys to filter models by tier during runtime
• Tier filter badge shown in header (e.g., [Tier S])
• E key elevates filter (show fewer, higher-tier models)
• D key descends filter (show more, lower-tier models)
• Preserves ping history when changing filters

Fixed

• Error 401 with --tier flag: Fixed issue where using --tier alone would show selection menu instead of proceeding directly to TUI
• Improved flag combination handling for better user experience

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