fix(config): normalize empty/whitespace TESTSPRITE_PROFILE to unset

[0xshalah]

One-line fix: wraps env.TESTSPRITE_PROFILE with normalizeEnvVar() so an
empty/whitespace-only value is treated as unset and resolves to the "default"
profile — consistent with TESTSPRITE_API_URL and TESTSPRITE_API_KEY.

3 new unit tests added (empty, whitespace-only, blank-with-credentials).
eslint + prettier + tsc all clean locally.

Summary by CodeRabbit

• Bug Fixes

  • Improved configuration loading when the profile environment setting is empty or contains only whitespace.
  • Automatically falls back to the default profile in these cases, including its configured credentials.

• Tests

  • Added coverage for empty, whitespace-only, and default profile configuration scenarios.

[coderabbitai]

Walkthrough

loadConfig now trims TESTSPRITE_PROFILE before resolving the active profile, treating empty and whitespace-only values as unset. Unit tests cover fallback to the default profile and credential loading from that profile.

Changes

Configuration profile normalization

Layer / File(s)	Summary
Profile resolution and fallback tests src/lib/config.ts, src/lib/config.test.ts	loadConfig normalizes TESTSPRITE_PROFILE before applying the default fallback, with tests for empty, whitespace-only, and default-profile credential behavior.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related issues

• [Hackathon] Normalize empty/whitespace TESTSPRITE_PROFILE env var to fall back to the default profile #232 — Directly addresses the same TESTSPRITE_PROFILE normalization and fallback behavior.
• [Hackathon] Fix empty env var config fallback and make bundle re-commit atomic #97 — Covers the broader pattern of treating empty or whitespace environment variables as unset.

Possibly related PRs

• TestSprite/testsprite-cli#8 — Applies the same normalizeEnvVar pattern to other configuration environment variables.

Suggested reviewers: zeshi-du, ruili-testsprite

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes implement #231 by normalizing TESTSPRITE_PROFILE and adding the requested fallback tests.
Out of Scope Changes check	✅ Passed	All changes are directly related to the config fix and its tests; no unrelated edits are shown.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: treating empty or whitespace TESTSPRITE_PROFILE values as unset.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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