[JSdotNet]

Summary

On the graduated roadmap axis, dragging a bar's resize grip moved a whole week at a time — even across the day columns around today. A resized edge now snaps to the column lines the axis draws: a day near today, then a week, a month and a quarter further out, by pointer and keyboard alike.

Changes

• Pointer: the track publishes its column lines (data-roadmap-snaps) and each grip its edge position (data-roadmap-edge-rem); components.js counts the lines crossed and sends that count instead of weeks.
• Keyboard: Shift/Alt+arrow steps the end/start edge one column line per press.
• Domain: RoadmapWindow.ColumnBoundaries lists the lines; RoadmapChange.For takes them as an optional argument and RoadmapChange.Step resolves a step count to a date. Script and .NET count the same lines, so the preview and the drop stay one value.
• Unchanged: moving a whole bar, and resizing on a plain all-quarter window, still snap to the week. A no-change drag still reports nothing; an edge pulled past the opposite edge clamps to the shortest bar the columns allow.
• Storybook Roadmap description and the RoadmapSlot doc comment updated to match.

Testing

• dotnet build Backlog.sln: 0 warnings, 0 errors.
• All 28 test executables green (0 failed). 5 new tests in RoadmapGraduatedAxisTests cover the boundary list, day-tier and month-tier steps, clamping, and Shift+Arrow on a graduated timeline.
• Desktop harness, Roadmap pane, real Playwright pointer drag (cancelled with Escape, nothing written): the end edge grew 2 rem per day column near today and 3 rem per week column beyond; Escape restored it. No errors in the harness logs.

Related

No issue — an ad-hoc request from a session.

Follow-up: .devbook/design/interaction-guidelines.md:497 still says "Every gesture snaps to the week"; it belongs to a flow-spec change, not this PR.

Checklist

• Scope is focused and excludes unrelated changes
• Documentation or instruction files were updated when governance or behavior changed — Storybook text updated; the devbook interaction guideline is the follow-up above
• Running Aspire instances for this checkout were stopped before PR creation (aspire stop --apphost … for this worktree)
• Follow-up work is captured when the implementation is intentionally partial
• Issues this PR closes are linked with a closing keyword, or there are none

🤖 Generated with Claude Code