feat(tui): add rtgl-progress-bar primitive

[han4wluc]

Summary

• add new rtgl-progress-bar primitive to @rettangoli/tui
• support progress rendering via value/max (or total) and explicit percent
• support width, label, percent visibility, fill/empty chars, precision, and status/color styling
• register primitive in default TUI primitive map
• add showcase examples for task completion and deploy progress
• update docs (package README + TUI docs site) to include rtgl-progress-bar
• add primitive unit tests and runtime render integration assertion

Files

• packages/rettangoli-tui/src/primitives/progressBar.js (new)
• packages/rettangoli-tui/src/primitives/index.js
• packages/rettangoli-tui/test/tui/progress-bar-primitive.test.js (new)
• packages/rettangoli-tui/test/tui/runtime-render.test.js
• packages/rettangoli-tui/examples/showcase/components/showcase/showcase.store.js
• packages/rettangoli-tui/examples/showcase/components/showcase/showcase.view.yaml
• packages/rettangoli-tui/README.md
• apps/rettangoli.dev/pages/tui/docs/introduction/introduction.md
• apps/rettangoli.dev/pages/tui/docs/guides/primitives.md

Validation

• ran npm test in packages/rettangoli-tui
• result: 8 passed, 30 passed