design(board): keep the section count beside its name in the list view

[johnpc]

Design-polish pass — continuing on the List view (per owner direction). Looking at the section grouping (collapse-all makes it obvious), each section's task count floated at the far-right edge of the row, disconnected from its section name — "To do" on the left, "24" way out at ~1240px on desktop (and a big gap on mobile too). The clickable collapse-toggle header also had no hover feedback.

Fix (CSS-only, tokens only)

• Dropped flex: 1 from .list-section__name, so the name is content-width and the count sits immediately after it — "To do 24" reads as one cohesive label (Asana-style).
• Gave .list-section__head a hover tint (--tf-surface-2) + rounded padding, so it clearly reads as the interactive collapse toggle it is.

Before → after

Before: section counts were pushed to the far right, disconnected from the section name.
After (count hugs the name):

• Collapsed — desktop: https://files.jpc.io/d/jiFHA-list-sections-desktop.png
• Collapsed — mobile: https://files.jpc.io/d/MqFXo-list-sections-mobile.png
• Expanded boundary — desktop: https://files.jpc.io/d/Lh5my-list-sections-boundary-desktop.png

Full quality gate green; presentational-only. Verified against the sandbox (AWS_PROFILE=personal).