feat: show Flux inventory resources with navigation

[nklmilojevic]

The Flux view shows the reconciliation chain but does not list the resources in the owner inventory. This change adds a Managed resources section for Kustomization and HelmRelease objects. Press Enter on an entry to open its resource view.

The list uses .status.inventory.entries without reading each managed resource. Navigation resolves API group, kind, and namespace through cluster discovery. Entries for unknown kinds or invalid scopes show warnings. Inventories with spec.kubeConfig remain visible but have no local navigation targets.

The list shows up to 500 entries and reports the omitted count. Live status and child expansion are outside this change.

Validation: Rust formatting, Clippy with warnings denied, and the full test suite. Three new tests cover navigation for both Flux kinds, API group collisions, namespace scope, remote cluster settings, invalid or absent entries, refresh, and large lists. No live cluster test was run.

Closes #612

Agreed discussion: #561

[greptile-apps]

Greptile Summary

This PR adds a Managed resources section to the Flux GitOps view for Kustomization and HelmRelease inventories.

• Parses and displays up to 500 inventory entries without fetching each managed object.
• Resolves navigation targets through group-aware cluster discovery and validates resource scope.
• Disables local navigation for owners configured to reconcile against remote clusters.
• Adds coverage for API-group collisions, scope handling, malformed inventories, refresh behavior, and list limits.
• Documents the feature and its operational limitations.

Confidence Score: 5/5

The PR appears safe to merge; no actionable correctness, security, or repository-rule failures remain.

Group-qualified discovery, explicit scope checks, remote-cluster gating, bounded output, and focused tests support the new inventory-navigation behavior without exposing an established failure.

Important Files Changed

Filename	Overview
src/app/gitops.rs	Builds a group-aware discovery map and appends inventory findings to asynchronously gathered Flux results.
src/gitops.rs	Parses, limits, validates, and creates navigation targets for Flux inventory entries.
src/app/tests/flux.rs	Adds focused coverage for inventory navigation, malformed and remote inventories, refreshes, collisions, scopes, and list limits.
docs/features.md	Documents managed-resource inventory display, navigation behavior, limits, and remote-cluster restrictions.

Sequence Diagram

sequenceDiagram
    actor User
    participant App
    participant API as Kubernetes API
    participant Discovery as Cluster discovery
    participant View as GitOps view

    User->>App: Open or refresh GitOps view
    App->>API: Read selected resource
    App->>API: Resolve and read Flux owner
    App->>Discovery: Build kind/group navigation map
    App->>App: Parse owner status.inventory.entries
    App->>View: Display up to 500 managed resources
    User->>View: Press Enter on inventory entry
    alt Local owner and valid discovered scope
        View->>App: Navigate using qualified plural, namespace, and name
    else Remote owner or invalid/unavailable kind
        View->>User: Show warning without navigation target
    end

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