[workshop-ui-screenshots] Add theme-aware SVG screenshots for 3 workshop images

Summary

This PR adds light/dark SVG pairs and updates Markdown to use GitHub's theme-aware <picture> pattern for three GitHub UI workshop images.

Generated light/dark pairs

Stem	Light	Dark	Change type
`08-run-workflow-confirm-dropdown`	`08-run-workflow-confirm-dropdown-light.svg`	`08-run-workflow-confirm-dropdown-dark.svg`	Migrates existing single-theme image
`00-workflow-run-complete`	`00-workflow-run-complete-light.svg`	`00-workflow-run-complete-dark.svg`	Migrates existing single-theme image
`08-run-lifecycle`	`08-run-lifecycle-light.svg`	`08-run-lifecycle-dark.svg`	Migrates existing single-theme diagram

Markdown files updated

workshop/00-welcome.md — replaced plain image ref for 00-workflow-run-complete.svg
workshop/08-run-your-workflow.md — replaced two plain image refs (confirm dropdown and lifecycle diagram)

QA

All 6 SVGs are valid, well-formed XML (verified with ElementTree)
Playwright currentSrc check confirmed correct variant selected for each color scheme on all three <picture> blocks
viewBox="0 0 1200 560", role="img", and aria-label present on all generated SVGs
Annotation labels at 24px within canvas bounds

Note

These are AI-generated conceptual illustrations of GitHub UI elements. Maintainers should replace them with real screenshots when available.

Warning

Firewall blocked 12 domains

The following domains were blocked by the firewall during workflow execution:

accounts.google.com
android.clients.google.com
awmgmcpg
clients2.google.com
clientservices.googleapis.com
host.docker.internal
optimizationguidepa.googleapis.com
redirector.gvt1.com
safebrowsingohttpgateway.googleapis.com
storage.googleapis.com
update.googleapis.com
www.google.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "accounts.google.com"
    - "android.clients.google.com"
    - "awmgmcpg"
    - "clients2.google.com"
    - "clientservices.googleapis.com"
    - "host.docker.internal"
    - "optimizationguidepa.googleapis.com"
    - "redirector.gvt1.com"
    - "safebrowsingohttpgateway.googleapis.com"
    - "storage.googleapis.com"
    - "update.googleapis.com"
    - "www.google.com"

See Network Configuration for more information.

Generated by 🖼️ Workshop UI Screenshot Generator · 159.9 AIC · ⌖ 7.58 AIC · ⊞ 6.7K · ◷

expires on Jul 26, 2026, 3:09 AM UTC