fix(question): show both language fields for MCQ options

Options editor used a single toggle-based bilingual field (BilingualInput)
that swapped English/Amharic in place via a tiny, easy-to-miss button.
Authors were filling English only and never noticing Amharic was empty.

- QuestionOptionsEditor: show separate always-visible English/Amharic
  TextInputs per option instead of the toggle field.
- BilingualInput (shared): for other callers still using the toggle,
  add a tooltip and a red dot indicator when the hidden language is
  empty, so the gap is visible without switching.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/backoffice/src/app/i18n/locales/am.ts

@@ -742,6 +742,8 @@ export const am: Translations = {
       title: "የመልስ አማራጮች",
       hint: "ትክክለኛውን አማራጭ ምረጥ/ምረጪ። ማስቀመጥ መላውን የአማራጭ ስብስብ ይተካል።",
       optionLabel: "አማራጭ {{number}}",
+      optionEn: "አማራጭ {{number}} (እንግሊዝኛ)",
+      optionAm: "አማራጭ {{number}} (አማርኛ)",
       correct: "ትክክለኛ",
       addOption: "አማራጭ ጨምር",
       save: "አማራጮችን አስቀምጥ",

apps/backoffice/src/app/i18n/locales/en.ts

@@ -743,6 +743,8 @@ export const en = {
       title: 'Answer Options',
       hint: 'Mark every correct option. Saving replaces the entire option set.',
       optionLabel: 'Option {{number}}',
+      optionEn: 'Option {{number}} (English)',
+      optionAm: 'Option {{number}} (Amharic)',
       correct: 'Correct',
       addOption: 'Add option',
       save: 'Save options',