Fix abbreviateNumber result.trim() return value not assigned back

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/module/abbreviateNumber.js

@@ -23,7 +23,7 @@ export default function abbreviateNumber(totalSeconds) {
   for(let i = 0; i < units.length; i++) {
     if(units[i] > 0) result += units[i] + symbols[i] + " ";
   }
-  result.trim();
+  result = result.trim();
   if(totalSeconds === 0) result = '0';
 
   return result;

tests/unit/module/abbreviateNumber.test.js

@@ -43,4 +43,9 @@ describe('abbreviateNumber', () => {
   it('handles NaN input', () => {
     expect(abbreviateNumber('abc').trim()).toBe('');
   });
+
+  it('does not have trailing whitespace', () => {
+    expect(abbreviateNumber(45)).toBe('45s');
+    expect(abbreviateNumber(3661)).toBe('1h 1m 1s');
+  });
 });