why

• a11y/snapshot.ts has large inline stringified scripts for scroll offsets, active-element lookup, and XPath building. stringified JS is not good practice as it is difficult to debug and is ignored by linting
• there was also duplicate selector resolution logic inside snapshot.ts which already exists inside locatorScripts dir

what changed

• added lib/v3/dom/a11yScripts plus a new genA11yScripts.ts generator so those helpers are bundled once, exported as strings and injected as needed
• added shared buildA11yInvocation & buildLocatorInvocation helpers that wrap the JS expressions with a guard that checks if the script already exists
• changed a11y/snapshot.ts to consume the generated helpers for scroll offsets, deep-active resolution, and XPath serialization, and to call locator scripts for CSS/XPath queries instead of embedding custom JS strings.

test plan

• existing tests

Summary by cubic

Replaced inline stringified JS in a11y/snapshot.ts with a generated a11y script bundle and small invocation helpers for cleaner, lintable code. Also routed CSS/XPath queries through existing locator scripts to remove duplicated logic.

• Refactors
  • Added lib/v3/dom/a11yScripts and genA11yScripts.ts to bundle and export a11y helpers as strings.
  • Introduced buildA11yInvocation and buildLocatorInvocation to inject bundles and call helpers safely.
  • Updated snapshot.ts to use generated helpers for scroll offsets, deep-active element, bounding rect, and absolute XPath.
  • Switched CSS/XPath resolution to locator scripts instead of custom inlined JS.
  • Trimmed ~180 lines of inline JS from snapshot.ts; improved debuggability and lint coverage.
  • Updated build-dom-scripts to include a11y script generation.

^{Written for commit a799be8. Summary will update automatically on new commits.}