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refactor(web): network connection form UX (part 4) (#3351)

This PR continues the network connection form reimplementation, built on
top of https://github.com/agama-project/agama/pull/3349. It adds edit
mode, fixes how the form derives the IP method when editing, and
introduces a not-found empty state.

### Edit mode

`ConnectionForm` is split into `NewConnectionForm` and
`EditConnectionForm`, both delegating to a shared
`ConnectionFormContent`. When a route `id` param is present, the form
pre-populates from the existing connection: IP mode, addresses,
gateways, DNS servers, and search domains are all restored. The
connection name field is not shown: it cannot be changed and the name is
already visible in the breadcrumb.

### Not-found empty state

When the connection id from the route does not match any known
connection, `EditConnectionForm` renders a `ConnectionNotFound` empty
state page instead of crashing.

### Postponed for follow-up PRs

- Auto-generated connection name.
- Evaluate if it "Advanced" mode must be shown when config has no method
but system already has addresses.

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