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/worklist/counts/route.ts

@@ -6,11 +6,11 @@ import { getWorklistCounts } from '@/lib/worklist'
 ensureInitialized()
 
 /**
- * GET /api/worklist/counts — all pending-work counts for the active company.
+ * GET /api/worklist/counts: all pending-work counts for the active company.
  *
  * Powers the "Att göra" surfaces (home-page section, sidebar badges) and
  * client-side refetch after an inline action completes. Read-only; every
- * count is a cheap head-only query that soft-fails to 0 — see lib/worklist.
+ * count is a cheap head-only query that soft-fails to 0: see lib/worklist.
  *
  * Response: { data: { counts: Record<WorklistCategory, number>, total } }
  */