YAML Diff, Resource Compare & Explain

This release is about seeing what changed: review your YAML edits as a diff, compare two resources side by side, and browse any Kind's schema like kubectl explain.

🔀 YAML Diff

• View changes (⇧⌘S, or the +N −M count in the action bar) opens your edits against the original in a side-by-side diff, with Apply (⌘↵) right there.
• Change markers in the YAML editor's gutter, with Next / Previous change (⌥F5 / ⇧⌥F5).
• Out-of-sync detection: if someone changes the resource on the cluster while you edit, the editor flags your draft as Stale. ⌘R shows what moved on the cluster, and Use latest replays your edits onto the live version, listing any field you both changed, for review before you apply.
• Deleted on the cluster is flagged in red: Apply is turned off, but you can still copy your YAML.
• Status-only updates don't count: changes to server-set fields (status, resourceVersion…) don't mark your draft as stale.
• The GitOps drift warning is now a compact chip naming the controller (Flux or Argo CD), with details on hover.

⚖️ Compare Two Resources

• Select two rows and Compare them from the row menu or the command palette: both sides stay live, even across clusters and namespaces.
• Open the comparison in a tab or panel: it restores with your layout and has a shareable zapkube:// link.
• Diff view toolbar, each with its own key: Include server-set fields (⌥S), Only differences (⌥D) collapses unchanged lines, Decode values (⌥V) shows a Secret's data in plain text, and Swap sides (⌥X).

📖 Explain

• The Explain page, Zapkube's kubectl explain: any Kind's field tree, read from the cluster's OpenAPI schema, with types, required fields, enum values and defaults. Works for CRDs too.
• Open it from anywhere: the API resources list, the sidebar, or the palette (Explain… for any Kind, Explain this kind from a resource list or detail page).
• Keyboard-first browsing: arrows to move, expand and collapse, / to filter by field path, and Expand all, Collapse all and Copy field path in the palette.
• Field docs in a peek card that follows your pointer or cursor; fields it lists are one click away in the tree.
• One context · version picker: switch between the clusters and API versions serving the Kind, with deprecated versions flagged with their warning.
• Copy kubectl explain and Open list from the page's menu.

✨ Other Improvements

• View YAML now opens in a dialog with syntax highlighting.
• Toasts can carry an action: a conflict on Apply offers View changes.
• The Settings dialog has a close button.

🐛 Fixes

• Toasts now show above an open dialog instead of under it.

🧹 Misc / Chore

• Bumped frontend and Go dependencies.