fix: remove unsafe as never type casts

[Kristyidu]

Description

Removes all \�s never\ type casts from the codebase, replacing them with properly typed alternatives.

Changes Made

src/services/segmentService.ts

• Removed \ argetValue as never\ and \ieldValue as never\ from .includes()\ calls
• \unknown[]\ already accepts \unknown\ as parameter, so casts were unnecessary

src/store/tests/transactionQueueStore.test.ts

• Properly typed \mockCreateSuperfluidStream\ with jest generic parameters
• Removed \�s never\ from mockResolvedValue return object

Verification

• All \�s never\ casts removed
• Runtime behavior unchanged

Closes #33