fix(text): match official bit rate units and precision

[s0up4200]

This continues the default-text parity work in #32, #33, #35, and #36, and fixes the first of the two defects left on the list in AGENTS.md.

The three bit rate formatters each used a different rule and none matched official MediaInfo. They are now one function that follows MediaInfoLib Kilo_Kilo123: each unit tier keeps one decimal until the source value passes ten times the tier, and every boundary is a strict "greater than", so 10 000 000 b/s still prints as 10 000 kb/s. Measured against official v23.04 on 32 real files: 2 better, 30 same, 0 worse, with JSON and --language=raw output byte-identical on every file.

Summary by CodeRabbit

• Bug Fixes
  • Improved bitrate formatting across DVD, Matroska, and MPEG media details.
  • Bitrates now display consistently with appropriate units and decimal precision.
  • Corrected 96 kb/s audio displays to show as 96.0 kb/s.
  • Standardized formatting at bitrate unit boundaries, including b/s, kb/s, Mb/s, and Gb/s.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 55854675-15a1-4f24-a5ef-388cef1d348f

📥 Commits

Reviewing files that changed from the base of the PR and between 90292ea and 984c91c.

⛔ Files ignored due to path filters (1)

• internal/mediainfo/testdata/golden/sample.mp4.csv is excluded by !**/*.csv

📒 Files selected for processing (7)

• internal/mediainfo/dvd.go
• internal/mediainfo/format_duration.go
• internal/mediainfo/format_duration_test.go
• internal/mediainfo/matroska_scan.go
• internal/mediainfo/mpeg_ps.go
• internal/mediainfo/testdata/golden/sample.mp4.html
• internal/mediainfo/testdata/golden/sample.mp4.txt

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📝 Walkthrough

Walkthrough

The shared bitrate formatter now uses MediaInfo-compatible unit tiers, scaling, rounding, and precision. DVD, Matroska, and MPEG-PS reporting paths use it. Unit tests and golden fixtures cover the updated output.

Changes

Bitrate formatting

Layer / File(s)	Summary
MediaInfo-compatible bitrate formatter internal/mediainfo/format_duration.go, internal/mediainfo/format_duration_test.go	The formatter now supports tiered b/s, kb/s, Mb/s, and Gb/s output with MediaInfo-compatible scaling and precision. Tests cover units, boundaries, rounding, and kb/s precision.
Parser bitrate display integration internal/mediainfo/dvd.go, internal/mediainfo/matroska_scan.go, internal/mediainfo/mpeg_ps.go, internal/mediainfo/testdata/golden/*	DVD, Matroska, and MPEG-PS display paths now use formatBitrate. Golden outputs change 96 kb/s to 96.0 kb/s.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Possibly related PRs

• autobrr/go-mediainfo#19: Both changes update Matroska bitrate formatting and statistics handling.
• autobrr/go-mediainfo#23: Both changes affect bitrate formatting in internal/mediainfo, including DVD and MPEG-PS paths.
• autobrr/go-mediainfo#25: Both changes affect DVD bitrate output and related MediaInfo formatting.

Suggested reviewers: audionut

Poem

A rabbit formats bits with care,
From b/s to gigabits in air.
Tiers align and tests now see
Each decimal precisely.
Golden pages match the tune—
Hop, review, and merge soon!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: aligning bit rate units and precision with official MediaInfo behavior.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/text-bitrate-units

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