Doc updates for AutoOps React migration

[wajihaparvez]

Summary

Updates text and screenshots to reflect the new React changes in AutoOps + updates text to reflect new Critical severity type. I also did some general clean up.

Main changes

Changes	Docs preview link
Overview: Updated page description; added note about region availability; reordered sections; refreshed Top Events description; updated screenshots	Overview
Deployment/Cluster view: Renamed "panels" to "sections" throughout; refreshed descriptions of Events over time, Open events, Event history, Resources, and Performance sections; added date/time picker guidance; updated screenshots	Deployment view
Events: Updated severity levels to add Critical, reordered the flyout table (severity and notification status now listed first); updated action names (Customize → Settings, Notifications → Edit notification settings, Share event link → Share event); updated screenshot, wording cleanup	Events
Event settings: Fixed title capitalization; updated instructions for accessing settings through the flyout actions menu; reordered settings list items; added screenshot of the Add event settings flyout	Event settings
Notifications settings: Updated connector setup steps (Add → Add connector, Validate → Run to test, Filter Setting → Filter setting); simplified per-connector instructions to use cross-references; updated notification status description, updated webhook SEVERITY field from 3 to 4	Notifications settings
Nodes view: Added instructions for using the deployment/cluster dropdown and node selector; removed separate Nodes table and Open Events sections (now covered in Deployment view); renamed "panels" to "sections"; updated screenshot	Nodes view
Indices view: Added guidance for the deployment/cluster dropdown and date/time picker; reordered navigation instructions; updated screenshot	Indices view
Shards view: Added new sections documenting UI controls (time slider, nodes/indices selectors, metric selector, shard matrix); added screenshot of the shard cell popover	Shards view
Template Optimizer: Expanded with new Recommendations and JSON Template sections; updated description of how templates are sorted; added new screenshot	Template Optimizer

Closes https://github.com/elastic/opex-product/issues/770, https://github.com/elastic/opex-product/issues/790

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes: cursor in auto mode; claude
• No

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🔍 Preview links for changed docs

• deploy-manage/monitor/autoops/ec-autoops-deployment-view.md
• deploy-manage/monitor/autoops/ec-autoops-event-settings.md
• deploy-manage/monitor/autoops/ec-autoops-events.md
• deploy-manage/monitor/autoops/ec-autoops-index-view.md
• deploy-manage/monitor/autoops/ec-autoops-nodes-view.md
• deploy-manage/monitor/autoops/ec-autoops-notifications-settings.md
• deploy-manage/monitor/autoops/ec-autoops-overview-view.md
• deploy-manage/monitor/autoops/ec-autoops-shards-view.md
• deploy-manage/monitor/autoops/ec-autoops-template-optimizer.md

[github-actions]

Vale Linting Results

Summary: 4 warnings, 2 suggestions found

⚠️ Warnings (4)

File	Line	Rule	Message
deploy-manage/monitor/autoops/ec-autoops-deployment-view.md	44	Elastic.DontUse	Don't use 'just'.
deploy-manage/monitor/autoops/ec-autoops-event-settings.md	30	Elastic.BritishSpellings	Use American English spelling 'dialog' instead of British English 'dialogue'.
deploy-manage/monitor/autoops/ec-autoops-events.md	36	Elastic.DontUse	Don't use 'just'.
deploy-manage/monitor/autoops/ec-autoops-nodes-view.md	19	Elastic.DirectionalLanguage	Don't use directional language. Use 'the label of the element' instead of 'on the right side'.

💡 Suggestions (2)

File	Line	Rule	Message
deploy-manage/monitor/autoops/ec-autoops-events.md	35	Elastic.Wordiness	Consider using 'whether' instead of 'whether or not'.
deploy-manage/monitor/autoops/ec-autoops-template-optimizer.md	35	Elastic.Repetition	"the" is repeated.

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[wajihaparvez]

React migration rollout has been pushed to a later date. This PR is on hold.

[wajihaparvez]

React migration is now unblocked. I've refreshed all the screenshots and text in 0c86829 to reflect the most recent changes.

[georgewallace]

Minor changes needed.