Motivation

• Provide a built-in, accessible toast notification component for SQLPage with plain-text or Markdown content, icons, colors, placement, auto-dismiss timing, manual dismissal, and predictable stacking for streamed/fragment-loaded toasts.
• Make toasts work correctly for both initial page loads and dynamically streamed fragments while remaining compatible with the existing Tabler/Bootstrap integration and SQLPage CSP constraints.

Description

• Add a Handlebars template sqlpage/templates/toast.handlebars that renders a .toast element with data-pre-init="toast", supports title, description, description_md (Markdown takes precedence), icon, color, dismissible, duration, position, id, and class, and uses icon_img/markdown helpers and accessible attributes (role="status", aria-live="polite").
• Add idempotent client-side initializer sqlpage_toast in sqlpage/sqlpage.js that normalizes position, creates/uses position-fixed .toast-container per placement, moves toasts into the shared container, normalizes duration, instantiates the framework toast (window.bootstrap || window.tabler.bootstrap), shows toasts, and removes generated containers when empty.
• Add official-site documentation migration examples/official-site/sqlpage/migrations/76_toast.sql inserting the toast component, parameters, defaults, and multiple executable examples demonstrating stacking, Markdown, persistence, and alternate placement.
• Add static rendering coverage tests/sql_test_files/component_rendering/toast.sql and a Playwright interaction spec addition in tests/end-to-end/official-site.spec.ts to validate visibility, stacking, timed/persistent behavior, dismissal, escaped vs. Markdown rendering, and placement, and update CHANGELOG.md accordingly.

Testing

• npm run format completed successfully and formatted JS files as expected.
• Migration/schema validation using sqlite3 ran and validated the new migration, confirming component/parameter/example rows and JSON validity for examples.
• npx biome check/npm test were executed for the modified frontend files; the checks completed but the repository-wide Biome run surfaced unrelated pre-existing diagnostics (missing parseInt radix instances and several style warnings) that are outside the scope of this change.
• cargo test was attempted but could not complete in this environment because building native libsqlite3-sys hit a Rust toolchain limitation (cfg_select unstable feature); Playwright end-to-end tests were not executed because the official-site server could not be started due to that build issue.

Codex Task