feat(connections): edit a connection from its own right-click menu

[Alexfp28]

Authored by Alex López (Alexfp28) <alexlopezdelafuente@gmail.com>. Suggested by David.

What

A saved connection's settings had exactly one route: File → Manage connections, then find the row again in a list that is routinely fifty long — starting from a tree node that already knew precisely which connection was meant. The right-click menu covered the connection's contents (refresh, create database, export, security) and its placement (new window, disconnect), but not the connection itself.

ConnectionActionsMenu now offers Edit connection…, which opens the manager focused on that profile.

How

useConnectionDialog.openManage has taken a profile id since the command palette needed one, so this is a second caller for an existing capability rather than a new surface. FileMenu stays the dialog's single mount point and resolves the id against the live profile list at render time — which is also what makes a profile deleted between the click and the render fall back to a new draft instead of dangling.

Two placement decisions:

• In the tail group beside "Open in new window", not with the content actions above it, because it edits the connection itself rather than anything inside it.
• Offered in the disconnected branch too, and that branch is where it matters most: a connection that will not open is exactly the one whose host, port or username wants correcting.

Tests

pnpm test (1336) and tsc --noEmit clean. The new connectionsTree.editConnection key is present in both locales, which src/lib/i18n/keys.test.ts enforces.