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>

lib/extensions/_generated/enabled-extensions.ts

@@ -1,4 +1,4 @@
-// AUTO-GENERATED — do not edit. Run `npm run setup:extensions` to regenerate.
+// AUTO-GENERATED: do not edit. Run `npm run setup:extensions` to regenerate.
 
 export const ENABLED_EXTENSION_IDS: ReadonlySet<string> = new Set([
   'enable-banking',

lib/extensions/_generated/extension-list.ts

@@ -1,4 +1,4 @@
-// AUTO-GENERATED — do not edit. Run `npm run setup:extensions` to regenerate.
+// AUTO-GENERATED: do not edit. Run `npm run setup:extensions` to regenerate.
 import type { Extension } from '../types'
 import { enableBankingExtension } from '@/extensions/general/enable-banking'
 import { emailExtension } from '@/extensions/general/email'

lib/extensions/_generated/sector-definitions.ts

@@ -1,4 +1,4 @@
-// AUTO-GENERATED — do not edit. Run `npm run setup:extensions` to regenerate.
+// AUTO-GENERATED: do not edit. Run `npm run setup:extensions` to regenerate.
 import type { ExtensionDefinition } from '../types'
 
 export const EXTENSION_DEFINITIONS: Record<string, ExtensionDefinition[]> = {
@@ -78,7 +78,7 @@ export const EXTENSION_DEFINITIONS: Record<string, ExtensionDefinition[]> = {
           "description": "Synka säkerhetsbackup till din egen molnlagring",
           "longDescription": "Koppla ditt Google Drive-konto och ladda upp en fullständig säkerhetsbackup med ett klick. Accounted skapar en ZIP med SIE-filer, kvitton och behandlingshistorik och laddar upp till en egen mapp i din Drive. Perfekt för att uppfylla egna krav på redundans.",
           "hasOwnData": true,
-          "subscriptionNotice": "Kräver ett Google-konto. Uppladdningar sker direkt till din Drive — ingen data lagras hos tredje part utöver Google."
+          "subscriptionNotice": "Kräver ett Google-konto. Uppladdningar sker direkt till din Drive: ingen data lagras hos tredje part utöver Google."
     },
     {
           "slug": "skatteverket",
@@ -88,7 +88,7 @@ export const EXTENSION_DEFINITIONS: Record<string, ExtensionDefinition[]> = {
           "icon": "FileCheck",
           "dataPattern": "core",
           "description": "Skicka momsdeklaration direkt till Skatteverket via BankID.",
-          "longDescription": "Anslut till Skatteverket med BankID och skicka din momsdeklaration direkt från gnubok. Spara utkast, validera, lås och signera — utan att lämna appen."
+          "longDescription": "Anslut till Skatteverket med BankID och skicka din momsdeklaration direkt från gnubok. Spara utkast, validera, lås och signera: utan att lämna appen."
     },
     {
           "slug": "invoice-inbox",
@@ -97,7 +97,7 @@ export const EXTENSION_DEFINITIONS: Record<string, ExtensionDefinition[]> = {
           "category": "import",
           "icon": "Inbox",
           "dataPattern": "both",
-          "description": "Vidarebefordra leverantörsfakturor till en unik adress – dokumenten landar här med extraherade fält",
+          "description": "Vidarebefordra leverantörsfakturor till en unik adress: dokumenten landar här med extraherade fält",
           "longDescription": "Varje bolag får en unik fakturainkorg-adress. Fakturor som skickas dit fångas automatiskt och fält som org.nr, OCR, bankgiro, belopp och förfallodatum läses av med AI (kräver AI-funktionen). Utan AI lagras dokumentet ändå och fälten fylls i manuellt.",
           "readsCoreTables": [
                 "document_attachments",

lib/extensions/_generated/workspace-map.tsx

@@ -1,4 +1,4 @@
-// AUTO-GENERATED — do not edit. Run `npm run setup:extensions` to regenerate.
+// AUTO-GENERATED: do not edit. Run `npm run setup:extensions` to regenerate.
 import dynamic from 'next/dynamic'
 import type { ComponentType } from 'react'
 import type { WorkspaceComponentProps } from '../workspace-registry'