Empty state (goal with zero contributions) was rendering a flat-at-$0
saved series and a flat-at-$0 projection that looked broken to anyone
opening a freshly created goal. Now show.html.erb branches on
@goal.goal_contributions.empty? and renders a piggy-bank + "Add a
contribution" CTA card before the chart card. Brand-new goals get a
clean inline call-to-action instead of a misleading line at zero.
No-target-date goals (target_amount set, target_date null) used to
render a standalone "Set a target date" prompt card and hide history
entirely. Now they render the chart with the saved history + the
target horizontal line (no projection segment, no projection legend
item), plus a secondary "Set target date" callout below the chart
linking into the edit modal. History is informative even without a
deadline.
Locale: new goals.show.empty.{heading,body,cta}.
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