feat: support custom node role label sources

[nklmilojevic]

Nodes with custom role labels showed <none> in ROLES. Add [node_roles].label_prefixes and label_keys so the built-in column can collect roles from custom key suffixes and label values. Both Kubernetes sources remain active; roles are sorted and duplicates are removed.

The settings support startup, cluster/context overrides, and reload. Display, filtering, and sorting use the same values. Empty prefixes produce a warning and are skipped. Custom path columns retain their own values.

Agreed discussion: #577 (comment)

Closes #614

Validation: just check (format check, clippy with warnings denied, and all tests). Added keyboard-driven tests for defaults, custom sources, empty values and prefixes, duplicate roles, filtering, sorting, overrides, reload, and custom views.

[greptile-apps]

Greptile Summary

This PR adds configurable label prefixes and exact label keys for deriving the built-in node ROLES column.

• Preserves the two built-in Kubernetes role-label sources.
• Compiles, deduplicates, and propagates custom sources through startup, reload, and context changes.
• Uses the resulting role text consistently for display, filtering, and sorting.
• Documents override behavior and adds coverage for custom sources, duplicate roles, warnings, lifecycle changes, and custom views.

Confidence Score: 5/5

The PR appears safe to merge; no actionable correctness, security, or repository-rule issues were identified.

The configured sources are compiled and refreshed across each supported lifecycle path, and all node-role consumers share the same extracted value without altering custom path-backed columns.

Important Files Changed

Filename	Overview
src/config.rs	Adds deserialization and compilation of custom node-role prefixes and exact label keys, including empty-prefix warnings and deduplication.
src/columns.rs	Threads compiled sources into node view contexts and extends the existing role extractor while preserving custom path-column behavior.
src/app/rows.rs	Attaches the current node-role configuration whenever the active view specification is rebuilt.
src/app/actions.rs	Recompiles node-role sources during configuration reload before refreshing the view.
src/app/pickers.rs	Resolves node-role sources for the newly selected cluster or context before rebuilding its resource view.
src/main.rs	Compiles startup node-role configuration and exposes configuration warnings consistently.
src/app/tests/node_roles.rs	Covers reload, overrides, filtering, sorting, deduplication, empty inputs, warnings, and custom view source selection.
docs/configuration.md	Documents source semantics, built-in defaults, override behavior, reload support, and custom-view interactions.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
    C["Base, cluster, and context config"] --> M["Resolve overrides"]
    M --> P["Compile node-role sources"]
    P --> A["App.node_roles"]
    A --> V["Attach sources to node ViewSpec"]
    V --> E["Extract built-in and custom roles"]
    E --> N["Sort and deduplicate"]
    N --> D["Display"]
    N --> F["Filter"]
    N --> S["Sort"]

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