docs(sidepanel): modal mode with close disabled (#DS-2313)

[NikGurev]

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Pull request overview

This PR adds documentation for the sidepanel's modal mode with close disabled. It introduces a new docs example (sidepanel-disable-close) demonstrating the disableClose config option, which prevents closing via backdrop click or Escape while still allowing explicit close actions. It fits into the existing sidepanel documentation set alongside other examples like normal-mode, overlayed, and custom-injector.

Changes:

• New docs example component (SidepanelDisableCloseExample + ExampleSidepanelDisableCloseContent) opening a modal sidepanel with disableClose: true.
• Registered the example in index.ts, the generated example-module.ts, and the dev app module.
• Added English/Russian documentation sections describing disableClose, plus a note about updating it dynamically via KbqSidepanelRef.config.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/docs-examples/components/sidepanel/sidepanel-disable-close/sidepanel-disable-close-example.ts	New example demonstrating disableClose: true with a modal sidepanel.
packages/docs-examples/components/sidepanel/index.ts	Exports and registers the new example.
packages/docs-examples/example-module.ts	Generated registry entry and lazy-import case for the new example.
packages/components-dev/sidepanel/module.ts	Adds the example to the dev app imports and template.
packages/components/sidepanel/sidepanel.en.md / sidepanel.ru.md	New documentation subsection for disabling close.
packages/components/sidepanel/examples.sidepanel.en.md / examples.sidepanel.ru.md	Notes that disableClose/hasBackdrop can be updated dynamically.

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