feat(ci): Replace deprecated TeXLive action with working alternative

[Meatball-Sub-11]

Goal:
Fix the failing CI build by replacing the deleted teatimeguest/setup-texlive-action@v3 with a working alternative TeXLive setup action.

Context:
The current GitHub Actions CI pipeline is failing because it references a deleted TeXLive setup action. The error shows:

Error: An action could not be found at the URI 'https://api.github.com/repos/teatimeguest/setup-texlive-action/tarball/ff7075d1802f73f131689d381f345a8dc5a5000'

• Repo / path: .github/workflows/ci.yml line 50
• User story: As a contributor, I want the CI pipeline to work properly so that pull requests can be validated and the project can be built successfully
• Relevant links:
  • Current failing action (deleted/unavailable)
  • Replacement action
  • GitHub Marketplace listing
• Notes: The replacement action TeX-Live/setup-texlive-action@v3 is specifically mentioned as "a temp replacement for the deleted teatimeguest/setup-texlive-action" and maintains the same API compatibility.

Tasks:

• Design the feature specification
• Implement core functionality (update .github/workflows/ci.yml)
• Add appropriate tests (verify CI pipeline runs successfully)
• Update documentation (if needed)

Acceptance Criteria:

• CI pipeline runs successfully without the TeXLive action error
• PDF generation continues to work as expected
• All existing TeXLive packages are still installed correctly
• Build artifacts (PDF, ePUB) are generated successfully
• No breaking changes to existing functionality

Implementation Details:
Replace:

- name: Setup TeX Live
  uses: teatimeguest/setup-texlive-action@v3

with

- name: Setup TeX Live
  uses: TeX-Live/setup-texlive-action@v3

The new action uses the same input parameters and maintains compatibility with the existing configuration.

Additional context / screenshots:

• Current CI failure shows the action repository is no longer accessible
• The replacement action is actively maintained by the TeX-Live organization
• Version v3.4.2 is the latest stable release as of September 2025