bsk fill cannot set date, time, datetime-local, month, or week inputs #440

Prerequisites

• Searched open issues/PRs; no match for date-like fill support. fix(extension): restrict fill to editable controls and editor roots #301 only changed contenteditable descendants.

Background / Description

isFillable treats every <input> as a candidate, but the live preflight only allows text|search|tel|url|email|password|number. Date-like controls are rejected with target_not_fillable, even though they accept a programmatic value (HTMLInputElement.value + input/change).

file / checkbox / radio should stay out of bsk fill (file → bsk upload). The gap is date, time, datetime-local, month, and week.

Evidence

• Cheap filter: apps/extension/src/tools/interaction.ts isFillable returns true for any INPUT.
• Live check: FILL_EDITABLE_FUNCTION only allows the seven text-like types.
• Skill docs (crates/bsk-cli/skill/SKILL.md) show bsk fill @e3 --value "text" and do not mention date-like controls as unsupported.

How a user hits it

On a booking / account form, observe shows @eN for “Depart” / “生日”. bsk fill @eN --value 2026-10-14 returns invalid_params / target_not_fillable. The agent then clicks calendar widgets or asks the user to type the date.

Suggested direction

Issue first (behavior change). A follow-up PR can set value for the date-like types and dispatch input/change, next to the existing fill browser tests.