Fixes #356.

Summary

• The network inspect view (i key) used a custom inline JSON viewer that just dumped json.Indent output — it was the only resource view doing this.
• Every other resource view in the project (services/nodes/secrets/configs/stacks/contexts) routes through the shared inspectview package, which parses JSON and renders a styled YAML-style document with ctrl+f search + n/N navigation, app-level / filter, and raw/yaml toggle.
• This PR reroutes the network i action through inspectview too, so users get a properly formatted document instead of raw JSON, with the same controls already used elsewhere in the TUI.
• Removes ~350 lines of duplicated inspect plumbing (state, viewport, search mode, render path) from views/networks.

Before:

{
  "Network": {
    "Name": "my-overlay-net",
    "Id": "abc123…",
    "Driver": "overlay",
    …

After (via shared inspectview):

Network: my-overlay-net  [YAML]

Network:
  Name: my-overlay-net
  Id: abc123…
  Scope: swarm
  Driver: overlay
  IPAM:
    Driver: default
    Config:
      [0]:
        Subnet: 10.0.0.0/24
Services:
  [0]: whoami

Test plan

• go build ./... — clean
• go test ./... — all unit tests pass
• golangci-lint run ./... --build-tags=integration — 0 issues
• Manual: open networks view, press i on a network → confirm YAML rendering, ctrl+f search, / filter, r raw toggle, esc back

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