feat(web): migrate charts to TanStack Charts#131

fix(web): restore chart strokes points and legend glyphs

fix(web): restore calendar ticks and grid boundaries

test(web): verify chart stacking and traffic request cancellation

fix(web): preserve chart space and labels under dense legends

docs(web): document the TanStack chart renderer

test(web): cover chart totals, singleton marks, and keyboard interactions

feat(web): migrate dashboard and file charts to TanStack Charts