feat(explorer): make @ cycle Cluster/Monitoring dashboard from any level

[janosmiko]

Summary

Reworks the @ hotkey behaviour:

• Works from any explorer level - previously @ only opened the Monitoring dashboard when the resource-type column was focused. It now backs out to the resource-types level first (reusing the same navigateParent loop the level-jump keys use), so it works from the resource list or any deeper view.
• Cycles Cluster / Monitoring - repeated presses toggle Cluster -> Monitoring -> Cluster, starting with the Cluster dashboard.

Changes

• internal/app/update_keys_actions.go - handleExplorerActionKeyMonitoring navigates up to the resource-types level, then targets the Cluster dashboard unless it is already selected (then Monitoring).
• internal/app/update_keys_actions_test.go - 4 tests: start-with-cluster, cluster->monitoring, monitoring->cluster, and the "select a cluster first" guard.
• internal/ui/help_sections.go, README.md, docs/keybindings.md - help/hint text updated.

Test plan

• go build ./...
• go vet ./internal/app ./internal/ui
• go test ./internal/app ./internal/ui
• golangci-lint run (0 issues, also enforced by pre-commit hook)

🤖 Generated with Claude Code

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 75fd42fe-0923-41da-8bb6-4cc4c872249f

📥 Commits

Reviewing files that changed from the base of the PR and between 56f78d5 and 206b3bf.

📒 Files selected for processing (5)

• README.md
• docs/keybindings.md
• internal/app/update_keys_actions.go
• internal/app/update_keys_actions_test.go
• internal/ui/help_sections.go

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Summary by CodeRabbit

• New Features

  • The @ shortcut now cycles between the Cluster and Monitoring dashboards.
  • Dashboard switching works from any explorer depth.
  • A clear prompt appears when no cluster is selected.

• Documentation

  • Updated the README, keybindings guide, and in-app help to describe the new dashboard-cycling behavior.

Walkthrough

The @ monitoring action now returns to the resource-types view and cycles between the Cluster and Monitoring dashboard entries. Tests cover initial selection, both cycling directions, and the missing-cluster error. README, keybinding documentation, and in-app help text describe the updated behavior.

Suggested reviewers: sp71

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: making @ cycle the Cluster/Monitoring dashboard from any explorer level.
Description check	✅ Passed	The description covers the summary, key changes, and test plan, though several template sections like type of change and related issue are omitted.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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