feat: add registerable actions to ProcessorTimeline and RouteFlow

Both components now accept `actions` (static) or `getActions` (dynamic
per-item) props. When provided, a "⋮" trigger appears on hover that
opens a Dropdown menu. Click propagation is stopped so action clicks
don't fire the row/node click handler.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

COMPONENT_GUIDE.md

@@ -207,8 +207,8 @@ URL-driven progressive filtering: /agents → /agents/:appId → /agents/:appId/
 | MonoText | primitive | Inline monospace text (xs, sm, md) |
 | Pagination | primitive | Page navigation controls |
 | Popover | composite | Click-triggered floating panel with arrow |
-| ProcessorTimeline | composite | Gantt-style pipeline visualization with selectable rows. Props: processors, totalMs, onProcessorClick?, selectedIndex? |
-| RouteFlow | composite | Vertical processor node flow diagram with status coloring, connectors, and click support. Props: nodes, onNodeClick?, selectedIndex? |
+| ProcessorTimeline | composite | Gantt-style pipeline visualization with selectable rows and optional action menus. Props: processors, totalMs, onProcessorClick?, selectedIndex?, actions?, getActions?. Use `actions` for static menus or `getActions` for per-processor dynamic actions. |
+| RouteFlow | composite | Vertical processor node flow diagram with status coloring, connectors, click support, and optional action menus. Props: nodes, onNodeClick?, selectedIndex?, actions?, getActions?. Same action pattern as ProcessorTimeline. |
 | ProgressBar | primitive | Determinate/indeterminate progress indicator |
 | RadioGroup | primitive | Single-select option group (use with RadioItem) |
 | RadioItem | primitive | Individual radio option within RadioGroup |