test(bling): add bats coverage for bling.sh

[castrojo]

Summary

Adds tests/test_bling_sh.bats for bling.sh itself (distinct from test_bling.bats which tests the ublue-bling installer).

bling.sh is sourced in every interactive bash and zsh session — it sets up aliases for eza/bat/ugrep and initializes direnv/starship/zoxide/mise.

Test cases

• BLING_SOURCED guard prevents double-sourcing
• eza aliases defined when eza is on PATH, absent when not
• bat alias defined when bat is on PATH, absent when not
• ugrep/ug aliases defined when ug is on PATH, absent when not
• Each initializer (direnv, starship, zoxide, mise) invoked when binary exists
• Graceful degradation when tools are missing — no aliases or initializers set

CI changes

• Adds Run bats (bling.sh) step to unit-tests.yml

Notes

unit-tests.yml is also modified by other test PRs from this sprint. Changes are additive; minor rebases may be needed.

Closes #575

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: cacb04b0-5123-4fb4-810e-c006ba3b46a7

📥 Commits

Reviewing files that changed from the base of the PR and between a717784 and 40904f6.

📒 Files selected for processing (2)

• .github/workflows/unit-tests.yml
• tests/test_bling_sh.bats

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/test-bling-sh

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