Same pure structural move as the previous commit, applied to the one
other remaining genuine component in shared/src (a self-contained
widget with its own behaviour + CSS, same class as hive-btn/hive-
dialog/hive-toast/hive-menu/side-panel/tabs) -- not the CSS-foundation
files (colors/theme/base/chrome.css) or the utility modules (forms.js,
dom.js, modal.js, shadow-css.js), which aren't components and don't
fit the one-dir-per-component convention.
External callers resolve terminal.js/terminal.css only through
@hive/shared's exports map, so again the two exports targets are the
only external-facing change. index.js's own internal re-export uses a
relative path within the package, so that needed updating too. Zero
call-site changes outside @hive/shared. Verified the built dashboard
(flow.js/common.css) and agent (app.js/agent.css) bundles still
resolve both files.