Handle null sync progress text in mps-sync-plugin3

[Copilot]

The status widget in mps-sync-plugin3 rendered Synchronizing: null when sync progress was unavailable for a branch. This change preserves the existing label when progress exists and falls back to Synchronizing when it does not.

• Status text formatting

  • Route syncing label rendering through a dedicated formatter.
  • Return Synchronizing for null progress.
  • Keep Synchronizing: <progress> unchanged for non-null progress.

• Regression coverage

  • Add focused tests for both null and non-null syncing progress text.

internal fun formatSyncingStatusText(progress: String?): String {
    return progress?.let { "Synchronizing: $it" } ?: "Synchronizing"
}

[abstraktor]

@copilot reword the commits to satisfy the commit linter

[Copilot]

@copilot reword the commits to satisfy the commit linter

Locally rewritten the two commit messages as 48420aa7 and 052c24b5, and they pass commitlint. The available push path here only does fast-forward pushes, so the non-fast-forward update needed to replace the existing commits was rejected.

[github-actions]

Test Results

  256 files  +1    256 suites  +1   50m 32s ⏱️ + 1m 11s
1 468 tests +2  1 457 ✅ +2  11 💤 ±0  0 ❌ ±0 
1 478 runs  +2  1 467 ✅ +2  11 💤 ±0  0 ❌ ±0 

Results for commit 93996d8. ± Comparison against base commit 7b66c35.

♻️ This comment has been updated with latest results.

[github-actions]

JVM coverage report

Overall Project	59.49% -0.01%	❌
Files changed	52.38%	❌

File	Coverage
ModelSyncStatusWidget.kt	2.08% -1.39%	❌