style: remove em/en dashes repo-wide, add CLAUDE.md rule against them (#890)

Em dashes (—) and en dashes (–) had spread across comments, docs, tests,
and a few UI strings, reading as AI-generated boilerplate rather than
house style. Replaced each with punctuation matching its context: colon
for explanatory clauses, comma for asides, plain hyphen for numeric/legal
ranges (e.g. "21-23§"), "to"/"till" for date ranges, parentheses for
paired-dash asides. messages/en.json and messages/sv.json were fixed by
hand together to keep sv/en in sync.

Left untouched where the dash is the functional subject rather than
decorative punctuation: date-range-parser.ts's separator regex,
charset-repair.ts's CP1252 byte-mapping table (and its test), the SIE
encoding mojibake docs, generic-csv.ts's minus-sign normalizer, the
agent system-prompt files that already instruct against em dashes, and
a golden iXBRL test fixture compared byte-for-byte.

Also fixes two bugs surfaced along the way: an off-by-one in
ApiKeysPanel's scope-label split (a leftover from an earlier partial
pass), and a charset-repair test that had lost the literal en-dash it
exists to verify.

Regenerated the agent atom seed migration (skills:generate) since 27
SKILL.md files changed. Added a CLAUDE.md rule against em/en dashes,
with an explicit carve-out for the functional-dash cases above.

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

app/api/pending-operations/bulk-commit/__tests__/route.test.ts

@@ -182,7 +182,7 @@ describe('POST /api/pending-operations/bulk-commit', () => {
       {
         id: VALID_ID_2,
         status: 'skipped',
-        error: 'Hög risk — kräver individuellt godkännande',
+        error: 'Hög risk: kräver individuellt godkännande',
       },
     ])
     expect(body.data.summary).toEqual({

app/api/pending-operations/bulk-commit/route.ts

@@ -60,7 +60,7 @@ export async function POST(request: Request) {
       results.push({
         id,
         status: 'skipped',
-        error: 'Hög risk — kräver individuellt godkännande',
+        error: 'Hög risk: kräver individuellt godkännande',
       })
       continue
     }