fix(ci): remove platform-dependent build failures

[johnnyhuy]

Root causes

• The pipeline test sourced generate.sh, which executed the generation loops on a clean Ubuntu checkout. The macOS development checkout passed only because ignored generated assets caused those loops to skip.
• The iOS build queried CoreSimulator even though CI only needs compilation. Hosted macOS runners intermittently time out before xcodebuild starts.

Fix

• guard the video generation entry point so functions can be sourced without executing the pipeline
• test the real source path instead of extracting a partial script
• add ios:build:ci using the generic iOS Simulator destination with signing disabled
• keep device-specific local build and UI-test tasks unchanged
• update checkout to v7.0.1 and mise-action to v4.2.3 using pinned commit SHAs

Verification

• 23 pipeline checks pass
• 95 Swift tests pass
• mise run ios:build:ci succeeds
• shell syntax, workflow YAML parsing, and git diff checks pass

Co-authored-by: opencode-agent noreply@opencode.ai