feat: add text locators

[cpendery (cpendery)]

Summary

• add lazy, reusable text locators across Rust, Python, and JavaScript
• support literal/regex matching, viewport or full scrollback, whitespace normalization, anchors, match locations, and any / unique / first / last / nth selection
• re-resolve locators for waits and actions; click the middle matched cell and highlight selected matches in the live monitor and SVG screenshots
• allow Playwright-style stacked searches with parent.locator(child), constrained to the dynamically resolved parent region
• add a single CLI flow: tui-test locator "T" --action locations|wait|click|highlight
• keep findText / find_text / find text compatibility helpers and make waitText / wait_text return the locator they waited on
• version the daemon protocol independently so same-package-version older daemons restart before receiving new locator requests

Examples

const settings = terminal.locator("Settings Save", { whitespace: "normalize" });
await settings.locator("Save").click();

const items = terminal.locator(String.raw`item \d+`, { regex: true });
await items.highlight();
await items.nth(1).expect({ style: { bold: true } });

tui-test locator "Save" --match last --action click
tui-test locator 'item\s+\d+' --regex --action highlight

Test plan

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets --all-features -- -D warnings
• cargo clippy -p tui-test-rs --all-targets --no-default-features -- -D warnings
• cargo build
• cargo test --workspace -- --test-threads=1
• python -m unittest discover -s bindings/python/tests
• python bindings/python/scripts/generate_stubs.py --check
• npm run test:node --prefix bindings/js

This draft consolidates and supersedes #150, #151, #152, and #154.