fix: clean up upgrade output and hide empty table headers

[BYK]

Clean up the ugly cli upgrade output and fix a systemic issue with
empty header rows in box-drawing tables across the codebase.

Upgrade output

Before:

Binary: Installed to /home/byk/.local/bin/sentry
✓ Upgraded to  0.18.0-dev.1773836960
0.18.0-dev.1773794950 → 0.18.0-dev.1773836960

╭─────────┬─────────╮
│         │         │
├─────────┼─────────┤
│ Method  │ curl    │
│ Channel │ nightly │
╰─────────┴─────────╯

After:

✓ Upgraded to 0.18.0-dev.1773836960 (from 0.18.0-dev.1773794950)
  Method: curl · Channel: nightly

Changes:

• Replace metadata table with a compact muted inline line
• Remove redundant version arrow; fold "from" version into success line
• Add --quiet to cli setup subprocess to suppress leaked stdout

Systemic table fix

mdKvTable() without a heading produces | | | empty header cells,
which rendered as an ugly empty bordered row in box-drawing tables.
This affected 12 call sites: auth status, issue/org/project details,
trace/span/log views, and more.

Fix: add hideHeaders option to renderTextTable and auto-detect
all-empty headers in renderTableToken to skip the header row while
still using it for column width measurement.

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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Entries from this PR are highlighted with a left border (blockquote style).

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New Features ✨

• Refactor SKILL.md into modular reference files by BYK in #458

Bug Fixes 🐛

• (test) Use os.tmpdir() for test temp directories by BYK in #457

• Clean up upgrade output and hide empty table headers by BYK in #459

• Improve error messages — fix ContextError/ResolutionError misuse by BYK in #456

Internal Changes 🔧

• (list) Align all list commands to issue list standards by BYK in #453

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_{🤖 This preview updates automatically when you update the PR.}

[github-actions]

Codecov Results 📊

✅ 116 passed | Total: 116 | Pass Rate: 100% | Execution Time: 0ms

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	—
Failed Tests	—
Skipped Tests	—

✨ No test changes detected

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 1147 uncovered lines.
✅ Project coverage is 95.21%. Comparing base (base) to head (head).

Files with missing lines (2)

File	Patch %	Lines
human.ts	96.35%	⚠️ 46 Missing
markdown.ts	91.04%	⚠️ 30 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    95.21%    95.21%        —%
==========================================
  Files          176       176         —
  Lines        23930     23934        +4
  Branches         0         0         —
==========================================
+ Hits         22783     22787        +4
- Misses        1147      1147         —
- Partials         0         0         —

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