Update Elixir to v1.18 and upgrade all dependencies

[rossvz]

Summary

• Updated Elixir from ~> 1.14 to ~> 1.18
• Upgraded all dependencies to their latest compatible versions using mix deps.update --all and mix igniter.upgrade --all
• Updated dependency version constraints in mix.exs to match current versions

Key Dependency Updates

• ash: ~> 3.0 → ~> 3.11
• ash_postgres: ~> 2.0 → ~> 2.6
• ash_phoenix: ~> 2.0 → ~> 2.3
• bandit: ~> 1.6 → ~> 1.10
• credo: ~> 1.0 → ~> 1.7
• ecto_sql: ~> 3.12 → ~> 3.13
• phoenix_live_view: ~> 1.0 → ~> 1.1
• swoosh: ~> 1.17 → ~> 1.20
• igniter: ~> 0.6 → ~> 0.7
• styler: ~> 1.3 → ~> 1.10
• tailwind: ~> 0.3 → ~> 0.4
• Plus other minor updates (see full diff)

Testing

• ✅ All 45 tests passing
• ✅ Mix format check passing
• ✅ Credo strict linting passing
• ✅ Full CI pipeline passing (mix ci)

Notes

• Code was automatically formatted by styler during the update process (2 .heex files)
• All dependencies resolved successfully without conflicts
• No breaking changes detected

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Note

• Upgrade runtime/toolchain: Set elixir to ~> 1.18 in mix.exs.
• Dependencies: Update constraints and refresh mix.lock (e.g., ash 3.11, ash_postgres 2.6, ash_phoenix 2.3, bandit 1.10, ecto_sql 3.13, phoenix_*, swoosh 1.20, credo 1.7, tailwind 0.4, etc.).
• Templates: Minor HEEx formatting/readability changes in app.html.heex and about_live/index.html.heex (comments, multiline attributes); no functional UI changes.

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