<hive-agent-menu> bundled two concerns: the agent-specific trigger/item
list, and generic "click a trigger, get a positioned dropdown" mechanics
(shadow attach, open/close, singleton close-on-open coordination,
outside-click/Escape handling). Pulled the latter out into a new
@hive/shared/hive-menu.js (<hive-menu>), following the established
per-component-directory + ._opts-before-append shadow-DOM pattern
(<hive-dialog>). <hive-agent-menu> now just builds the "⋮" trigger and
the action list and hands them to an internal <hive-menu> instance.
<hive-menu> takes ownership of every <hive-menu> instance in the app for
singleton coordination (closeAllMenus, renamed from closeAllAgentMenus)
— a deliberate widening from the old per-agent-menu-only tracking, since
the mechanism was never agent-specific to begin with.
The one subtlety worth spelling out: <hive-menu> projects the caller's
opaque trigger/content nodes via named <slot>s rather than moving them
into its own shadow root. That's load-bearing, not cosmetic — if it
re-parented them into its own shadow tree instead, <hive-agent-menu>'s
own classes (.agent-menu-btn, .agent-menu-item, ...) would stop applying,
since a <style> only styles elements within the same shadow tree/document
it's part of, and only slotting (not re-parenting) keeps the caller's
nodes in the caller's own tree for styling purposes. That in turn made
<hive-agent-menu>'s own shadow root redundant once it wasn't the thing
positioning or owning open/close state anymore, so it's dropped in favor
of a plain light-DOM element styled by dashboard.css (already the one
page it renders on) — hive-agent-menu.css is gone, its rules folded into
dashboard.css's per-agent-menu section, minus the positioning rules that
moved into hive-menu.css as the new generic `.menu-dropdown` wrapper.
Verified with a standalone esbuild bundle + a cached nix chromium driven
over raw CDP (no puppeteer/playwright/python3 available): hover-reveal
opacity, dropdown open/close/positioning, outside-click/Escape dismissal,
and cross-instance singleton coordination all behave identically to
before the split.
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