- Take origin/main as base for data-transformers.ts, types/content.ts and
  tests/data-transformers.test.ts (which had landed PRs #453, #457, etc.)
- Apply our PR changes on top:
  * extractPropRef: tighten regex to \d{4}\/\d{2}:\d+ (strict ID format)
  * groupMotionsByProposition: add export keyword; keep {grouped,independent}
    return type from main; replace inline lang-switches with L() labels
  * generateMotionsContent: use L(lang,'responsesToProp') and
    L(lang,'independentMotions') instead of 14-branch ternary chains
  * groupPropositionsByCommittee: new exported helper (Map<committeeKey,[...]>)
  * generatePropositionsContent: committee-grouped rendering (h3 per committee,
    h4 per prop when multi-committee; h3 per prop + Referred-to line otherwise)
    reuses byCommitteeGroup.size for policyImplicationsContext domainCount
  * ContentLabelSet: add responsesToProp and independentMotions fields
  * CONTENT_LABELS: add both new fields to all 14 language objects
- Tests: add unit tests for exported helpers ({grouped,independent} API),
  label presence tests (28 tests for 2 keys × 14 langs), proposition grouping
  rendering tests; all 1674 tests passing across 39 test files

Co-authored-by: pethers <[email protected]>

… take-main + apply)

Take origin/main as clean base for data-transformers.ts, types/content.ts,
tests/data-transformers.test.ts and sitemap.xml (main had landed PRs #453,
#457, #469 etc.), then re-apply every PR-specific change on top:

data-transformers.ts:
  - svSpan(): fix data-translate direction per translation workflow
    (lang!='sv' → data-translate="true"; lang='sv' → no marker)
  - PROP_REFERENCE_REGEX: strict \d{4}\/\d{2}:\d+ (was \S+)
  - PROP_FULL_REF_REGEX: non-greedy [^<]+? with HTML-tag lookahead
  - export groupMotionsByProposition (was private)
  - generateMotionsContent: replace 14-branch ternaries with
    L(lang,'responsesToProp') / L(lang,'independentMotions')
  - use PROP_FULL_REF_REGEX + svSpan() for proposition group heading
  - export groupPropositionsByCommittee (new)
  - generatePropositionsContent: committee-grouped rendering
    (h3+h4 when multi-committee; h3+referredLine when single-committee)
  - Add responsesToProp + independentMotions to all 14 language objects

scripts/types/content.ts:
  - Add responsesToProp: string; independentMotions: string to ContentLabelSet

tests/data-transformers.test.ts:
  - Import groupMotionsByProposition and groupPropositionsByCommittee
  - Fix 8 existing svSpan tests: flip data-translate expectations to match
    corrected svSpan() semantics
  - Add 5 unit tests for groupMotionsByProposition (strict-ID regex, fallback
    to title field, empty input, total-count invariant)
  - Add 5 unit tests for groupPropositionsByCommittee (organ/committee fallback,
    empty-string key, empty input, total-count invariant)
  - Add 28 label-presence tests (2 keys × 14 langs)
  - Add 4 rendering tests (single-committee h3, multi-committee h4,
    referredLine shown/hidden)

All 1672 tests pass across 39 test files.

Co-authored-by: pethers <[email protected]>