fix: chunk large JCEF messages to prevent JetBrains sidebar freezes #6507

Job	Run time
core-checks	4m 26s
vscode-get-test-file-matrix	2m 21s
jetbrains-tests	10m 57s
prettier-check	47s
vscode-checks	1m 39s
vscode-package-extension-linux	6m 14s
binary-checks	2m 20s
get-packages-matrix	9s
gui-checks	1m 55s
track-rerun	-1s
packages-checks (config-types)	1m 16s
packages-checks (llm-info)	1m 12s
packages-checks (openai-adapters)	2m 9s
packages-checks (continue-sdk)	1m 17s
packages-checks (terminal-security)	1m 18s
packages-checks (fetch)	1m 20s
packages-checks (config-yaml)	1m 40s
packages-checks (hub)	1m 11s
e2e/_output/tests/KeyboardShortcuts.test.js (e2e:ci:run)	4m 20s
e2e/_output/tests/PromptFile.test.js (e2e:ci:run)	3m 13s
e2e/_output/tests/Edit.test.js (e2e:ci:run)	3m 43s
e2e/_output/tests/GUI.test.js (e2e:ci:run)	2m 44s
e2e/_output/tests/Autocomplete.test.js (e2e:ci:run-yaml)	3m 38s
e2e/_output/tests/PromptFile.test.js (e2e:ci:run-yaml)	3m 8s
e2e/_output/tests/KeyboardShortcuts.test.js (e2e:ci:run-yaml)	4m 3s
e2e/_output/tests/Autocomplete.test.js (e2e:ci:run)	3m 51s
e2e/_output/tests/GUI.test.js (e2e:ci:run-yaml)	2m 38s
e2e/_output/tests/Edit.test.js (e2e:ci:run-yaml)	3m 26s
require-all-checks-to-pass	2s
	1h 16m 56s

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