feat(i18n): server-genererad prosa -> nyckel+params (min dag, ombokning, scan-diff)

- Min-dag-noten: noteKey (estimateNote/computedNote) bredvid svensk note; klient t(noteKey).
- Ombokningsskäl (planning.ts): rescheduleReasonKey + params bredvid rescheduleReasonSv;
  klient t(key, {title}). Workerns två andra ombokningstexter lämnade på svensk fallback.
- Scan-diff: reasonCode-enum (6 koder) bredvid reasonSv; klient t(scanDiff.reason.<code>).
- 8 nya nycklar i alla 12 språk. Ingen beslutslogik rörd; alla Sv-fält kvar som fallback.
- Kvar som egna spår: recept-säkerhetsmeddelanden + substitutions-data (översättningstabell).
- typecheck grönt (20/20), vakt grön, inventory-engine 53/53 tester.

Co-Authored-By: Claude <noreply@anthropic.com>

apps/mobile/src/locales/en/common.json

@@ -601,5 +601,13 @@
   "onboarding.allergen.mustard": "Mustard",
   "onboarding.allergen.sulphites": "Sulphites",
   "onboarding.allergen.lupin": "Lupin",
-  "onboarding.allergen.molluscs": "Molluscs"
+  "onboarding.allergen.molluscs": "Molluscs",
+  "myday.computedNote": "Values are calculated from recipes and food data and shown as estimates.",
+  "plan.rescheduleReason": "{title} was moved here because the ingredients should be used first.",
+  "scanDiff.reason.moved_and_qty": "Moved and quantity changed",
+  "scanDiff.reason.moved": "Moved to another location",
+  "scanDiff.reason.qty_changed": "Quantity changed",
+  "scanDiff.reason.unchanged": "Unchanged",
+  "scanDiff.reason.new_item": "New item in the photo",
+  "scanDiff.reason.vanished": "Missing from the new photo — confirm it's used up"
 }