fix(types): allow quarter units in isSameOrBefore/isSameOrAfter

[veerareddyvishal144]

Fixes #3192

Problem
isSameOrBefore and isSameOrAfter reject 'quarter' | 'quarters' | 'Q' with TS2345 (not assignable to parameter of type 'OpUnitType'), even though the runtime supports quarter granularity once the quarterOfYear plugin is loaded (it patches startOf/endOf, which isSame/isBefore/isAfter delegate to).

Root cause: types/plugin/isSameOrBefore.d.ts and types/plugin/isSameOrAfter.d.ts typed the unit param as OpUnitType only, while types/plugin/quarterOfYear.d.ts already exposes quarter support via QUnitType (and uses QUnitType | OpUnitType for startOf/endOf).

Change

• types/plugin/isSameOrBefore.d.ts: unit?: OpUnitType -> unit?: QUnitType | OpUnitType
• types/plugin/isSameOrAfter.d.ts: same

This mirrors the existing startOf/endOf union pattern in quarterOfYear.d.ts.

Verification

• Reproduced with tsc --strict: 6x TS2345 errors for 'quarter'/'quarters'/'Q' before the fix, 0 after; invalid units (e.g. 'decade') still error via @ts-expect-error check.
• Runtime check (quarterOfYear + isSameOrBefore/After extended): quarter comparisons return correct results, including 'Q' shorthand.
• Existing suites pass: isSameOrBefore, isSameOrAfter, quarterOfYear (24 tests).

[veerareddyvishal144]

Closing as duplicate — #3155 already covers #3192. Thanks for catching it; picking up a different issue instead.