* fix: prevent MCP server edit from creating a duplicate on name change
When editing an MCP server, changing the name field caused a brand-new
duplicate server to be created instead of updating the existing one,
leaving the original untouched. It only happened when the name input
was changed.
Root cause: the backend PATCH /mcp/servers/{server_name} endpoint
upserts keyed by the name in the URL path, and the edit modal built the
PATCH URL from the edited name. A changed name therefore retargeted the
request to a new key, so the backend created a new server rather than
updating the original.
The server name is the immutable identifier (the storage key and the
PATCH URL path), so during edit we now:
- always reuse the original name (initialData.name) for the request
instead of re-deriving it from the input, and
- lock the name input, consistent with how the type tabs are already
disabled in edit mode.
Adds regression tests covering the locked name field (STDIO + HTTP) and
that editing patches the original name without firing the create flow.
* fix: immutable server names
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