Remove Bootstrap styling dependency from ng-kit library

[pavankjadda]

Summary

• Bundle Bootstrap 5-style CSS for button directives and alerts in the library's ng-kit cascade layer. Existing button, alert, spinner, and dialog class names remain; the demo still imports Bootstrap 5 for its layout.
• Render the library spinner as an indeterminate Angular Material progress spinner. Keep bootstrapSpinner as a deprecated, no-op input so existing bindings compile.
• Replace Bootstrap-dependent dialog spacing with library CSS and update the demo documentation and tests.

Validation

• pnpm run test: 114 passed.
• pnpm run lint: 0 errors, 31 existing warnings.
• pnpm run build and pnpm run build:demo: passed.
• Playwright: 40 passed before the final class-name correction; the 10 alert, button, dialog, and home tests passed again afterward.
• With the demo Bootstrap import temporarily disabled, checked button styling and loading animation, alert colors and dimensions, and dialog title typography. The import was restored.

Migration notes

• The default spinner appearance changes from Bootstrap to Material. [bootstrapSpinner] is still accepted but has no effect.
• Class names are unchanged. The bundled button CSS uses global names such as .btn, .btn-primary, and .gap-1, so those selectors can also affect unrelated elements using the same names.
• In apps that use CSS layers, declare ng-kit before utility layers so utility rules retain precedence.
• Without Bootstrap, alerts use Bootstrap 5's light color palette as a fallback. Apps need theme overrides for a different dark palette.

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