Flaky CI: playwright-examples shard fails when the remote Playwright server port is already in use (EADDRINUSE)

[Bug]: `shiny.module` re-exports are stripped from generated type stubs, so Pyright rejects them in Shinylive

fix(tests): Reduce ~48s runtime of AI-generated slider bookmarking test

epic: Speed up slow Playwright tests in CI

[Feature]: Pass additional parameters from `navset_card_*()` to `card()`

chore: Add cache for docker image step

bug: Dangling reactivity - reactive objects persist after dynamic UI is removed

Feature Request: Server-side File Selection (Similar to R Shiny's shinyFiles)

test(otel): Internal testing

test: Update toolbar playwright tests