[Obs AI Assistant] Fix page height of the AI Assistant page

[viduni94]

Closes #231292

Summary

The AI Assistant page was not taking the full height of the viewport as only the max block size was set.
This PR fixes it by defining the height of the page (with respect to the headers in each solution view and classic view).

Before

After

Current layout - Classic space

Current layout - Obs space

Current layout - Search space

New layout - Classic space

New layout - Obs space

New layout - Search space

Testing instructions

1. Current layout - Verify that the AI Assistant page takes full height in a classic space, observability space and search space.
2. Add the following to kibana.dev.yml to enable the new grid layout

feature_flags.overrides:
  core.chrome.layoutType: 'grid'

3. Refresh Kibana
4. Verify that the AI Assistant page takes full height in a classic space, observability space and search space in the new grid layout as well.

Checklist

• The PR description includes the appropriate Release Notes section, and the correct release_note:* label is applied per the guidelines
• Review the backport guidelines and apply applicable backport:* labels.

Release notes

Fixes the page height of the Observability AI Assistant page

[elasticmachine]

Pinging @elastic/obs-ai-assistant (Team:Obs AI Assistant)

[viduni94]

Related to #225263

[github-actions]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[viduni94]

/oblt-deploy

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 5806dab
• Kibana Serverless Image: docker.elastic.co/kibana-ci/kibana-serverless:pr-233924-5806dabbaa1a

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
observabilityAIAssistantApp	177.7KB	177.7KB	-8.0B

Saved Objects .kibana field count

Every field in each saved object type adds overhead to Elasticsearch. Kibana needs to keep the total field count below Elasticsearch's default limit of 1000 fields. Only specify field mappings for the fields you wish to search on or query. See https://www.elastic.co/guide/en/kibana/master/saved-objects-service.html#_mappings

id	before	after	diff
_data_stream_timestamp	1	-	-1
_doc_count	1	-	-1
_ignored_source	1	-	-1
_index_mode	1	-	-1
_inference_fields	1	-	-1
_tier	1	-	-1
apm-custom-dashboards	5	-	-5
apm-server-schema	2	-	-2
apm-service-group	5	-	-5
application_usage_daily	2	-	-2
config	2	-	-2
config-global	2	-	-2
coreMigrationVersion	1	-	-1
created_at	1	-	-1
created_by	1	-	-1
entity-definition	9	-	-9
entity-discovery-api-key	2	-	-2
event_loop_delays_daily	2	-	-2
favorites	4	-	-4
file	11	-	-11
file-upload-usage-collection-telemetry	3	-	-3
fileShare	5	-	-5
infra-custom-dashboards	4	-	-4
infrastructure-monitoring-log-view	2	-	-2
intercept_trigger_record	5	-	-5
legacy-url-alias	7	-	-7
managed	1	-	-1
ml-job	6	-	-6
ml-module	13	-	-13
ml-trained-model	7	-	-7
monitoring-telemetry	2	-	-2
namespace	1	-	-1
namespaces	1	-	-1
observability-onboarding-state	2	-	-2
originId	1	-	-1
product-doc-install-status	7	-	-7
references	4	-	-4
sample-data-telemetry	3	-	-3
security-ai-prompt	8	-	-8
slo	11	-	-11
space	5	-	-5
synthetics-monitor	34	-	-34
synthetics-monitor-multi-space	34	-	-34
tag	4	-	-4
type	1	-	-1
typeMigrationVersion	1	-	-1
ui-metric	2	-	-2
updated_at	1	-	-1
updated_by	1	-	-1
upgrade-assistant-ml-upgrade-operation	3	-	-3
upgrade-assistant-reindex-operation	3	-	-3
uptime-synthetics-api-key	2	-	-2
url	5	-	-5
usage-counters	2	-	-2
total			-246

History

• 💚 Build #335840 succeeded afa6162

cc @viduni94