fix(alias): fix alias generation and highlighting for prefix-related slugs

[BYK]

Summary

Fixes two issues with issue list output when one project slug is a prefix of another (e.g., cli and cli-website).

Issue 1: Double-Dash in Aliases

When generating aliases, slugs like cli-website would get alias cli- (ending with dash), causing double-dashes in issue shorthands.

Before	After
cli → cli, cli-website → cli-	cli → c, cli-website → w
cli-33, cli--1 ❌	c-33, w-1 ✓

Issue 2: SHORT ID Highlighting

Highlighting now shows exactly which characters form the alias:

SHORT ID	Alias	Highlighting
CLI-25	c-25	CLI-25
CLI-WEBSITE-4	w-4	CLI-WEBSITE-4

Changes

• src/lib/alias.ts: Added applyPrefixRelationships() to detect when one slug is a prefix of another and use the suffix for differentiation
• src/lib/formatters/human.ts: Added formatShortIdWithAlias() to highlight only the alias characters (project prefix letter + issue suffix)
• test/lib/alias.test.ts: Added 3 test cases for prefix relationships

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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Bug Fixes 🐛

• (alias) Fix alias generation and highlighting for prefix-related slugs by BYK in #203

Other

• test: add tests for project-cache and env-file modules by BYK in #200

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[github-actions]

Codecov Results 📊

✅ Patch coverage is 97.50%. Project has 1749 uncovered lines.
✅ Project coverage is 78.15%. Comparing base (base) to head (head).

Files with missing lines (34)

File	Patch %	Lines
human.ts	55.31%	⚠️ 391 Missing
resolve-target.ts	15.28%	⚠️ 366 Missing
oauth.ts	25.10%	⚠️ 194 Missing
api-client.ts	70.62%	⚠️ 176 Missing
upgrade.ts	45.49%	⚠️ 139 Missing
migration.ts	47.44%	⚠️ 82 Missing
telemetry.ts	77.51%	⚠️ 56 Missing
api.ts	89.80%	⚠️ 47 Missing
seer.ts	75.54%	⚠️ 45 Missing
schema.ts	89.56%	⚠️ 40 Missing
seer.ts	79.87%	⚠️ 30 Missing
preload.ts	53.23%	⚠️ 29 Missing
utils.ts	88.94%	⚠️ 25 Missing
detector.ts	90.10%	⚠️ 20 Missing
code-scanner.ts	95.00%	⚠️ 16 Missing
arg-parsing.ts	90.00%	⚠️ 12 Missing
dsn-cache.ts	94.62%	⚠️ 12 Missing
fix.ts	83.61%	⚠️ 10 Missing
fs-utils.ts	57.14%	⚠️ 9 Missing
project-root.ts	97.73%	⚠️ 7 Missing
version-check.ts	91.14%	⚠️ 7 Missing
feedback.ts	84.21%	⚠️ 6 Missing
auth.ts	95.52%	⚠️ 6 Missing
upgrade.ts	93.83%	⚠️ 5 Missing
resolver.ts	94.57%	⚠️ 5 Missing
index.ts	95.96%	⚠️ 4 Missing
project-aliases.ts	97.40%	⚠️ 2 Missing
project-root-cache.ts	96.92%	⚠️ 2 Missing
alias.ts	99.42%	⚠️ 1 Missing
env-file.ts	99.19%	⚠️ 1 Missing
parser.ts	98.63%	⚠️ 1 Missing
colors.ts	97.96%	⚠️ 1 Missing
helpers.ts	94.74%	⚠️ 1 Missing
helpers.ts	94.74%	⚠️ 1 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    77.99%    78.15%    +0.16%
==========================================
  Files           58        58         —
  Lines         7933      8005       +72
  Branches         0         0         —
==========================================
+ Hits          6187      6256       +69
- Misses        1746      1749        +3
- Partials         0         0         —

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