feat(ui): instant match-score panel on the Candidate Fit tab

Adds a MatchScoreCard at the top of the Candidate Fit tab that loads the
deterministic /match-score endpoint independently of the slow AI
narrative, so users see a reproducible score, matched/missing keyword
chips, and per-section coverage immediately.

- MatchScore types + cached, attachment-independent load effect
- graceful 'not enough signal' state
- EN/NB translations
- frontend panel test (matched/missing/section + degraded state)
- backend integration tests for GetMatchScore (happy path + missing CV)
- README endpoint reference

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

job-tracker-ui/src/i18n/translations.ts

@@ -867,6 +867,20 @@ export const translations = {
     jobDetailsFollowUpSent: "Follow-up sent and logged.",
     jobDetailsFollowUpSendFailed: "Failed to send follow-up.",
     jobDetailsHowYouMatch: "How you match",
+    matchScoreTitle: "Match score",
+    matchScoreLoading: "Scoring your CV against this role…",
+    matchScoreBand_Strong: "Strong match",
+    matchScoreBand_Partial: "Partial match",
+    matchScoreBand_Low: "Low match",
+    matchScoreBand_Unknown: "Not enough signal",
+    matchScoreKeywordsCovered: "{matched}/{total} keywords",
+    matchScoreNoSignal: "Add more CV detail or a fuller job description to get a reliable score.",
+    matchScoreDeterministicHint: "Deterministic keyword coverage — no AI, so the score is stable and repeatable.",
+    matchScoreMatched: "Matched keywords",
+    matchScoreMissing: "Missing keywords",
+    matchScoreNoneYet: "No matches found yet.",
+    matchScoreAllCovered: "Every keyword is covered.",
+    matchScoreSectionCoverage: "Where your CV covers this role",
     jobDetailsStrategySnapshot: "Strategy snapshot",
     jobDetailsGenerateStrategySnapshot: "Generate strategy snapshot",
     jobDetailsStrategySnapshotEmpty: "Generate a snapshot to see fit, positioning, and immediate priorities in one place.",
@@ -1784,6 +1798,20 @@ export const translations = {
     jobDetailsFollowUpSent: "Oppfølging sendt og loggført.",
     jobDetailsFollowUpSendFailed: "Kunne ikke sende oppfølging.",
     jobDetailsHowYouMatch: "Slik matcher du",
+    matchScoreTitle: "Match-score",
+    matchScoreLoading: "Vurderer CV-en mot denne stillingen…",
+    matchScoreBand_Strong: "Sterk match",
+    matchScoreBand_Partial: "Delvis match",
+    matchScoreBand_Low: "Lav match",
+    matchScoreBand_Unknown: "For lite grunnlag",
+    matchScoreKeywordsCovered: "{matched}/{total} nøkkelord",
+    matchScoreNoSignal: "Legg til mer CV-innhold eller en fyldigere stillingstekst for en pålitelig score.",
+    matchScoreDeterministicHint: "Deterministisk nøkkelorddekning — ingen AI, så scoren er stabil og repeterbar.",
+    matchScoreMatched: "Treff på nøkkelord",
+    matchScoreMissing: "Manglende nøkkelord",
+    matchScoreNoneYet: "Ingen treff ennå.",
+    matchScoreAllCovered: "Alle nøkkelord er dekket.",
+    matchScoreSectionCoverage: "Hvor CV-en dekker denne rollen",
     jobDetailsStrategySnapshot: "Strategioversikt",
     jobDetailsGenerateStrategySnapshot: "Generer strategioversikt",
     jobDetailsStrategySnapshotEmpty: "Generer en oversikt for å se match, posisjonering og viktigste prioriteringer på ett sted.",