Add configurable probability display formats (%, 1-in-X, per million, hit rate)

[mnemoo]

Description

Currently, probabilities are displayed in a single fixed format. Different users intuitively understand probabilities in different ways, which can make the same value feel unclear or misleading depending on the context.

Idea:

Add a user setting that allows selecting the preferred probability display format.

Proposed formats:

• Percentage (e.g. 0.12%)
• 1 in X (e.g. 1 in 833)
• Per million / per N (e.g. 1200 per 1,000,000)
• Effective hit rate (e.g. ~1.2 hits per 1000 attempts)

Goals:

• Improve readability
• Reduce confusion around low-probability events
• Let users choose the representation that makes sense to them

Notes:

• This should be a presentation-only change (no impact on internal calculations)
• Default format should remain unchanged for existing users
• The setting can live in the general or advanced settings menu

Future considerations (optional):

• Context-aware defaults (e.g. rare drops → 1-in-X)
• Tooltips showing alternate formats on hover