fix(results): name and link Bloc STAR on the results page

[masiarek]

Description

Draft — depends on #1474. The learn_link added here points at docs.bettervoting.com/help/bloc_star.html, which is the page #1474 adds. Merging this first would ship a 404. Ready to un-draft the moment #1474 lands (or immediately, if you'd rather point it somewhere else — see below).

The results-page half of #1086. A STAR race with more than one seat is Bloc STAR, but the method is stored as plain "STAR" with the seat count in a separate field (num_winners), so Results.tsx had no way to know and:

• Location 1 — the label under the winner announcement read "Voting Method: STAR Voting".
• Location 2 — the help link read "How STAR Voting works" and pointed at methods.star.learn_link, the single-winner explainer.

Both come from the same two lines, so both are fixed by deriving the bloc case once:

const isBlocStar = votingMethodBase === 'STAR' && race.num_winners > 1;
const methodKey = isBlocStar ? 'star_bloc' : methodValueToTextKey[votingMethodBase];

plus a methods.star_bloc block (full_name: Bloc STAR Voting, short_name: Bloc STAR, learn_link) alongside the existing star / star_pr entries.

Scope — deliberately narrow, three things left alone:

1. The stored value is untouched. votingMethod: "STAR" + num_winners is arguably correct — the field names the ballot/tabulation family and the seat count names the seats, making "Bloc STAR" a derived label. This PR treats it that way and derives it at the display layer only. (Reasoning and the exact export lines: BV129 note.)
2. The "Edit Race" modal (UI displays 'STAR Voting' instead of 'Bloc STAR' and has incorrect help link #1086 problem area 1) is not fixed here. It has its own composition path (edit_race.bloc_multi_winner_adj), and doing it properly means deciding how the adjective composes for every method — Bloc Approval, Bloc Ranked Robin, multi-winner Plurality — which is a naming decision for maintainers, not a drive-by. Same reason Method name is incorrect - BV18 - Basic - Plurality - 5 candidates - 2 seats #912 and BV1820 - method names - STAR - STAR Bloc - STAR PR #904 exist.
3. useSubstitutedTranslation's methodKey (line ~450) is untouched — it feeds term substitution across many strings, and widening it is a separate blast radius.

So #1086 shouldn't be auto-closed by this; it should lose one of its three problem areas.

Translations: en-only. es / pl / pt-BR each carry a methods: block, so a missing star_bloc falls back to English rather than rendering a key — same behaviour as any newly added string.

Alternative if you don't want #1474: point methods.star_bloc.learn_link at https://electowiki.org/wiki/Bloc_STAR_Voting, as #1086 originally suggested, and this becomes independent and mergeable today.

Screenshots / Videos (frontend only)

Text-only change to an existing label and an existing anchor — no layout, no new elements. On a 2-seat STAR race the label reads "Voting Method: Bloc STAR Voting" and the link reads "How Bloc STAR Voting works".

Related Issues

Part of #1086 (results-page half only — see scope above). Follows #1474.

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