fix(doc-mode): flatten sidebar list + restore right-click context menu (#124)

Two regressions reported by the user:

1. The sidebar was grouping contracts under per-status sub-folders
   (active/idle/archived). The user explicitly does not want that —
   they want a flat list with status indicated by a colored dot on the
   right of each row.

2. The right-click context menu on contract rows was missing —
   start/pause/archive/delete/create-PR/update-PR are no longer
   reachable through the UI.

Fixes:

* Drop the SidebarGroup/bucketOf/GROUP_LABEL helpers; replace the
  grouped render with a flat sort by status precedence
  (active → paused → idle → draft → inactive → archived) then alpha
  by title within the same status. The existing dot-color palette is
  unchanged; the dot just moved from the LEFT of the contract title
  to the RIGHT (after the orchestrator-running pulse, when present).

* Wire `onContextMenu` through SidebarProps → DirectiveFolderProps →
  the folder header `<button>`. Page-level state captures the click
  position and the targeted directive; the existing
  DirectiveContextMenu component (start/pause/archive/delete/PR/
  Advance/Cleanup/PickUpOrders) renders on top.

* runAction helper centralises error handling: dispatches the API
  call, refreshes the sidebar list + bumps the document-folder
  refresh nonce on success, surfaces an alert on failure.

* Delete confirms via window.confirm and clears the URL when the
  deleted contract was the one selected.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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