refactor(tasks): extract taskTypeLabel utility and deduplicate triage/dashboard mappings (#85)

* fix(dashboard): translate task.taskType in Triage Tasks panel

The dashboard's "Triage Tasks" panel was rendering raw enum values
(URGENT_REVIEW, CLARIFY_SYMPTOMS, ASK_FOR_POSTCODE, ASK_HORSE_COUNT,
MANUAL_CLASSIFICATION) where the triage page itself maps them through
i18n via taskTypeLabel + t().

Mirrors the pattern at app/[locale]/triage/page.tsx:184–193 and 321:
- Adds useTranslations('triage') as tTriage.
- Adds the same taskTypeLabel(taskType) mapping.
- Replaces {task.taskType} with {tTriage(taskTypeLabel(task.taskType))}.

All five enum values are already keyed in messages/{en,fr}.json under
the triage namespace (urgentReview, askPostcode, askHorseCount,
clarifySymptoms, manualClassification). Fallback returns the raw
value if the map ever drifts out of sync.

Closes Finding 7 of docs/UAT_v1_1_TRIAGE_round2.md.

https://claude.ai/code/session_01PF4MU4P4Ytt9UcuVsbAzT5

* refactor: extract taskTypeLabel into shared utility

Both dashboard and triage pages had an identical taskTypeLabel mapping
copy-pasted between them. Move it to lib/utils/task-type-label.ts so
future enum or translation key changes only need to be made in one
place.

* Update lib/utils/task-type-label.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* fix(task-type-label): return null for unknown types and add unit tests

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Co-authored-by: RJK134 <167345619+RJK134@users.noreply.github.com>

* refactor(task-type-label): avoid double lookup in map callbacks

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---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Author: 5 people

__tests__/unit/utils/triage-task-type.test.ts

@@ -0,0 +1,46 @@
+import { describe, it, expect } from 'vitest';
+import { taskTypeLabel, TRIAGE_TASK_TYPE_LABEL_MAP } from '@/lib/utils/triage-task-type';
+
+describe('TRIAGE_TASK_TYPE_LABEL_MAP', () => {
+  it('covers all expected task types', () => {
+    expect(Object.keys(TRIAGE_TASK_TYPE_LABEL_MAP)).toEqual(
+      expect.arrayContaining([
+        'URGENT_REVIEW',
+        'ASK_FOR_POSTCODE',
+        'ASK_HORSE_COUNT',
+        'CLARIFY_SYMPTOMS',
+        'MANUAL_CLASSIFICATION',
+      ])
+    );
+  });
+});
+
+describe('taskTypeLabel', () => {
+  it('maps URGENT_REVIEW to urgentReview', () => {
+    expect(taskTypeLabel('URGENT_REVIEW')).toBe('urgentReview');
+  });
+
+  it('maps ASK_FOR_POSTCODE to askPostcode', () => {
+    expect(taskTypeLabel('ASK_FOR_POSTCODE')).toBe('askPostcode');
+  });
+
+  it('maps ASK_HORSE_COUNT to askHorseCount', () => {
+    expect(taskTypeLabel('ASK_HORSE_COUNT')).toBe('askHorseCount');
+  });
+
+  it('maps CLARIFY_SYMPTOMS to clarifySymptoms', () => {
+    expect(taskTypeLabel('CLARIFY_SYMPTOMS')).toBe('clarifySymptoms');
+  });
+
+  it('maps MANUAL_CLASSIFICATION to manualClassification', () => {
+    expect(taskTypeLabel('MANUAL_CLASSIFICATION')).toBe('manualClassification');
+  });
+
+  it('returns the raw enum value for an unknown task type', () => {
+    expect(taskTypeLabel('UNKNOWN_FUTURE_TYPE')).toBe('UNKNOWN_FUTURE_TYPE');
+  });
+
+  it('returns an empty string for an empty string input', () => {
+    expect(taskTypeLabel('')).toBe('');
+  });
+});