Adds hermes://mcp/install?name=NAME&config=B64 (base64url or standard
base64 JSON), mirroring Cursor's mcp/install deep link, so vendors and
docs can offer an "Add to Hermes" button.
- Electron: the existing generic hermes:// handler already forwards
{kind, name, params}; only its comment is updated (no new handler).
- Renderer: use-desktop-integrations routes kind=mcp/name=install into
a pending-install store; a new confirmation dialog shows the server
name and the FULL pretty-printed config (attacker-controllable input),
with a prominent caution for stdio command entries. Nothing is written
until the user confirms; existing names require a rename or cancel.
On confirm the server is merged over a fresh fetch of the current map
via saveMcpServers, then navigation lands on /skills?tab=mcp&server=…
so useDeepLinkHighlight focuses the new row.
- Validation: name ^[A-Za-z0-9._-]{1,64}$; config must decode to an
object with a string http(s) `url` or a string `command` (never both);
payloads over 32KB rejected; failures surface as a toast.
- Pure parser in src/lib/mcp-deeplink.ts with unit tests (url shape,
command shape, bad base64, non-object, javascript: URL, oversized).
- i18n keys in types + en/zh/zh-hant/ja/ar.
- Docs: "Add to Hermes link" section in the MCP config reference.
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