Adds a browser-local (localStorage only, no backend field) toggle in
the per-agent overflow menu's new settings section: whether otherwise-
collapsed <details> rows in the live terminal (long tool-results,
Write/Edit diffs, ...) default open. Message-bearing rows that already
default open (send/ask/answer/recv) are unaffected either way.
The shared terminal factory (frontend/packages/shared/src/terminal/terminal.js)
gains an optional expandDetails option (boolean or zero-arg function),
read live on every details()/detailsDiff() call rather than captured
once, so flipping the toggle mid-session applies to the next rendered
row without a reload. Unused by the dashboard's own terminal pane, so
its default-closed behaviour is unchanged.
Closes#2961.
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.
