Loose ends from the V1 → V2 refactor that the architecture commit
didn't sweep.
- Demo generator (B14): the `goal_spec[:contributions]` arrays
+ the `wedding_contribs` / `house_contribs` builders still
shipped in the file, but the seeding loop that consumed them
was deleted alongside `GoalContribution`. Dead data. Strip both
the per-goal arrays and the two locals. Goal balance/pace in
the demo family now derives from the linked depository
accounts' own seeded entries elsewhere in the generator.
- Goal stepper controller (B16): the `static targets` declaration
still listed `initialContributionAmount` and
`initialContributionAccountSelect`, and `refreshAccountSelect`
+ its two callsites still ran every time a linked-account
checkbox flipped. The HTML targets disappeared with the V2
stepper rebuild, so `has*Target` guards short-circuited and the
method was a no-op — but it was still dispatched on every
change. Drop the targets, the method, and the two callsites.
- Chart series rescue (B25): `Goal#balance_series_values` and
`FundingAccountsBreakdownComponent#sparkline_map` both swallowed
`StandardError` with a `Rails.logger.warn(…)`. The chart then
degraded to "target line only" silently. Promote the log to
`error` level and forward to Sentry when present (matching the
pattern in `Account::Syncer`, `Sync`, `PlaidItem`). Fallback to
empty result still preserved so the surface degrades instead of
500-ing.
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