New Preact `SidePanel` drawer — deliberately not the shared
`<hive-side-panel>` shadow-DOM custom element, same rationale as
StatusChips' Badge/Dropdown. Drops that element's drag-to-resize +
localStorage width persistence for this first slice (fixed width via
CSS); reuses agent.css's existing `.agent-inbox`/`.inbox-*`/
`.side-panel-empty` content classes verbatim, only the drawer chrome
itself is new (SidePanel.css). Kept mounted regardless of open/closed
state (toggles the `open` prop) rather than conditionally rendered, so
the slide/fade CSS transitions actually fire on both open and close.
- InboxPanel: renders `state.inbox` (already polled by useAgentState)
+ a "mark all read" action — plain `fetch()` to the dashboard's
`/api/agent/{name}/mark-all-read` (JSON response, same as app.js;
unlike pause/resume this one doesn't need a form-submit workaround).
- TodosPanel: new `useTodos` hook (same 4s poll cadence as app.js's
`refreshTodos`) + bulk select/mark-done via `api/todos/mark-done`.
- Both destructive-but-recoverable actions use a new `useConfirmClick`
two-click-arm hook instead of the old shadow-DOM `themedConfirm`
modal — lighter weight, no backdrop/dialog machinery needed for a
"did you mean to click that" nudge.
- HeaderPill: the inbox/todos count triggers in the header's right
cluster; Header.tsx gained a `pills` slot for them (mirrors the old
markup's `.agent-header-pills` third column).
- types.ts: added `InboxRow`/`TodoRow`, mirroring
`hive_sh4re::inbox::{InboxRow, LooseEnd}` (todo variant only —
`/api/todos` never returns the others).
Screenshot-verified against a mock server exercising both panels.
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