* refactor(desktop): Capabilities is a module at /capabilities
The Capabilities page lived in `app/skills/`, was exported as `SkillsView`
and was routed at `/skills`, although Skills is only one of its four tabs.
The name sent every reader to the wrong place.
- `app/skills/` becomes `app/capabilities/`, with one folder per topic:
`skills/`, `plugins/`, `mcp/`, and `catalog/` for the browser that the
skills and plugins tabs share.
- `SkillsView` becomes `CapabilitiesView`, in the plugin SDK too. The
bundled bots plugin reads the new export name.
- The route, its id and its view become `/capabilities` and
`capabilities`. The keybind action becomes `nav.capabilities` and the
sidebar item id follows, with its i18n keys in every locale.
- The `hermes://open/...` link that the plugin notice fires follows.
No alias is kept for the old route. A remembered `/skills` route no longer
matches a page; the restore path already drops a route it cannot validate
and opens the last session.
No behaviour change otherwise.
* refactor(desktop): each Capabilities tab owns its list, detail and writes
`CapabilitiesView` was one 770-line function. It held the tab routing, the
whole Skills tab and the whole Tools tab, while the Plugins and MCP tabs
already lived in their own files.
- `capabilities/index.tsx` is the page shell: tab selection, the search
header, the profile and connection scope, the refresh hotkey, and one
table that maps a tab to its component (1190 lines down to 230).
- `skills/` and `toolsets/` each hold their tab, detail pane, data hooks and
helpers. `scope-selector.tsx` holds the scope hook and its selector.
`primitives.tsx` holds what two tabs share.
- The shell still fetches the two installed lists, because the tab pills
count them for the tab the user is not on. Query keys are unchanged;
`store/hub-actions.ts` imports the skills key instead of copying it.
- Every tab is keyed on the scope, so a profile or connection switch mounts
a fresh tab. This replaces the epoch counters and manual resets. One small
change follows: a return to a scope seen before selects the first row, not
the row selected last time.
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