Chart tooltips answer three stacked questions: context (what am I
looking at), value (how much), relation (vs what). Time-series already
had all three; the other two were missing rows.
- Sankey links showed a bare "$X (Y%)" with no indication of which
flow was hovered. Links now lead with a swatch-dotted
"Source → Target" context line; nodes get the same dot + name
treatment, tying the card to the ribbon color. The context builder
escapes node names centrally (they're user-named categories).
- Goal projection adds a tertiary relation line — "52% of $20K
target" — computed from the payload the chart already carries, for
both the saved and projected segments. Hidden when the goal has no
positive target. Template is i18n-wired like the existing tooltip
strings (goals.show.projection.tooltip_target_relation).
Verified with Playwright against the running app: all three surfaces
pass computed-style and content assertions.
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