[Docs] Document buffTarget initialState and tooltipCondition in Scaling

[Lyeeedar]

Summary

Two documentation gaps found during the 2026-08-14 rotating review of the concepts area:

1. buffTarget technique effect initialState (modapi.md)

Commit 0f16b6e7 (2026-08-11) added initialState?: Record<string, Scaling> to CreateBuffTargetEffect (src/types/buff.ts) and BuffTargetTechniqueEffect (src/types/technique.ts). This field seeds a buff's internalState at application time using expressions evaluated in the applier's context, enabling debuffs that capture apply-time data (e.g. absorbed damage). The feature mirrors initialState already available on buffSelf. The documentation did not mention this field at all.

Added a new "Technique Effect Reference" section with a buffTarget entry covering the field and an example use case.

2. Missing tooltipCondition field in Scaling interface (scaling.md)

src/types/stat.ts defines tooltipCondition?: string on the Scaling interface — it controls whether a scaling value is shown in buff tooltips. This field was absent from the documented interface.

Added the field with its description to the Scaling interface block in scaling.md.

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