Use historical copy for Legacy applied proposals

[Chris0Jeky]

Summary

• Make the Legacy review card use the proposal's durable summary and a recorded/applied impact cue for Applied records.
• Preserve the populated backend presentation copy for pending proposals.
• Add an API-shaped regression covering both statuses with the same prospective presentation payload.

Verification

• npx vitest --run --maxWorkers=2 src/tests/components/review/ReviewProposalCard.diff.spec.ts (17 passed)
• npm run typecheck
• Scoped ESLint for the changed component and spec
• git diff --check
• Playwright/E2E not run; this is a focused rendering change.

Documentation

• docs/STATUS.md updated (no strategy or shipped-behavior documentation change needed)
• docs/IMPLEMENTATION_MASTERPLAN.md updated (not applicable)
• docs/TESTING_GUIDE.md / docs/MANUAL_TEST_CHECKLIST.md updated (not applicable)

Tracking

• Closes [Frontend][Legacy][Review] ReviewProposalCard renders prospective presentation copy for settled records #2121
• Linked issue project item status reviewed (Review while this PR is open)

CI Workflow Validation

• Not applicable; no workflow, deploy, script, or project-file changes.

Risk Notes

• Security impact: None.
• Behavior/regression risk: Applied Legacy cards no longer show prospective presentation copy; pending cards retain the existing path.
• Follow-up tasks: None.

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[Chris0Jeky]

Review gate (Codex credits exhausted, SC-9): one fresh-context reviewer confirmed the status discriminator matches the backend enum (normalizeProposalStatus), ProposalDto.Summary is required and always populated, and the new spec contradicts the pre-change output for the same presentation payload. Frontend Unit green at this head. Verdict SHIP. MEDIUM follow-up (Rejected/Failed/Expired/Dismissed still show prospective copy) plus two LOWs tracked in #2493.