fix: show inventory of the selected resource

[nklmilojevic]

The GitOps view showed the owner's inventory when the selected resource had a Flux owner label. Read .status.inventory.entries and spec.kubeConfig from the selected resource so that Managed resources shows the resources it manages.

Add a regression test that opens the view through the command input and refreshes it through the keyboard. The test checks the selected inventory, navigation with a remote parent, and removal of old entries when inventory is absent. Update the feature documentation.

Validation: just check passed, including formatting, clippy, and tests.

Closes #618

[greptile-apps]

Greptile Summary

The PR corrects the GitOps Managed resources section to use the freshly read selected resource rather than its resolved Flux owner.

• Reads .status.inventory.entries and spec.kubeConfig from the selected resource.
• Adds regression coverage for opening, refreshing, navigation, and clearing stale inventory entries.
• Updates the feature documentation to describe the selected-resource behavior.

Confidence Score: 5/5

The PR appears safe to merge, with the implementation, regression coverage, and documentation aligned on selected-resource inventory behavior.

No actionable failures remain; the changed lookup uses the same freshly fetched selected object for both initial display and refresh, while existing inventory parsing continues to handle remote configuration and absent entries.

Important Files Changed

Filename	Overview
src/app/gitops.rs	Switches inventory findings from the resolved Flux owner to the freshly read selected resource.
src/app/tests.rs	Adds regression coverage for selected inventory, remote-parent navigation, refresh, and absent inventory.
docs/features.md	Updates GitOps inventory documentation to match selected-resource semantics.

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