fix(dub): carry rounded timestamp seconds into minutes

[rudycelekli]

Summary

Formatting a timestamp such as 59.96 seconds calculates the minute before rounding the remaining seconds, producing 0:60.0 instead of 1:00.0. The same rounding issue occurs at later minute boundaries in shared labels and the active timeline formatter. Round to tenths before splitting minutes and seconds. This affects display labels, not audio or export timing.

Closes #2660.

Changes

• Round to tenths before decomposing timestamps; share the formatter with the active timeline.
• Synchronize relevant documentation and add a quiet credited Unreleased changelog entry.
• No new UI strings or locale keys; maintained version files are unchanged.

Type

• 🐛 Bug fix
• ✨ New feature
• ♻️ Refactor
• 📝 Documentation
• 🧪 Tests
• 🔧 CI / Build
• 🚀 Release prep

Testing

• Hosted CI audit at 2026-10-06T12:35:20.584679+00:00: no failing latest checks; required CLA passes. All latest reported checks completed successfully. No upstream merge performed.

• Focused shared formatter case fails before and passes after, covering minute/hour rounding boundaries; 5 unrelated utility cases skip. No React DOM/native UI or full typecheck run. Display-only fix.

• git diff --check and the repository changelog style gate pass.

• Focused JavaScript tests used Node 24.19.0 and a reused Vitest 5.0.1 runtime; this repository pins Vitest 4.1.11. No full build qualification is claimed.

• Full backend suites and bun run check:electron were not run locally. The human CLA signature is registered and the required CLA status passes; hosted results are reported separately below.

Checklist

• I've tested this locally
• Every commit author has signed the CLA (the CLA check tells you how)
• I've updated relevant documentation (if applicable)
• No local machine paths, logs, or personal env details in this PR
• Maintained version files are in sync (if an owner-requested bump): root package.json, pyproject.toml, backend/core/version.py, and lockfiles
• If this PR changes runtime behavior, the regression fixture at tests/fixtures/omnivoice_data/ still loads green on the smoke-matrix CI job (macOS + Windows + Linux)

Release cadence

VoiceStudio ships continuous-to-main — no release candidates, no soak windows.
Every merged PR is immediately part of rolling source (main) and Docker
:latest. Electron artifact rehearsals validate desktop packages without publishing.
Version bumps require owner approval; validated releases are tagged from main
and published explicitly under the release checklist.
Users who want stability install an Electron release or pin Docker :stable.

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📥 Commits

Reviewing files that changed from the base of the PR and between 286f46b and 0758452.

📒 Files selected for processing (6)

• CHANGELOG.md
• docs/dubbing/export.md
• electron/src/renderer/src/features/dub/dub-timeline.tsx
• electron/src/shared/utils/format.d.ts
• electron/src/shared/utils/format.js
• electron/src/shared/utils/utils.test.js

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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[greptile-apps]

[Medium risk] Fixes timestamp rounding in the dubbing timeline display.

No merge-blocking issue was identified in the changed code.

Summary

The PR rounds elapsed time to tenths before splitting it into minutes and seconds, then uses that formatter in the Electron dubbing timeline.

• Adds boundary regression cases and updates the changelog and dubbing documentation.

_{Reviews (1) · Last reviewed commit: "fix(dub): carry rounded timestamp second..."}

[github-actions]

All contributors on this pull request have signed the VoiceStudio CLA. Thank you!

[rudycelekli]

I have read the VoiceStudio CLA 1.0 and I hereby sign it.

[rudycelekli]

Recheck

[rudycelekli]

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