Split the Bedside clinical reference section out of calculators.js
(~1220 lines) into 20 focused ES modules under public/js/bedside/.
Each module owns one clinical topic (cardiac, seizure, sepsis, burns,
etc.) and exports an init() wired up by bedside/index.js. Shared
helpers live in shared.js and also set window._EM for back-compat
with the 4 remaining call sites in calculators.js.
Load order: classic defer calculators.js first, then module script
bedside/index.js. Handlers bind at DOM-ready; runtime _EM lookups
resolve after both are evaluated.
Makes bedside content editable per-section, shrinks calculators.js
from 4111 to 2891 lines, and keeps the existing Playwright smoke
suite (e2e/tests/bedside-smoke.spec.js) as the behavioral contract.
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