feat: track search usage

[barinali]

Proposed Changes

This pull request aims to introduce a tracking event for the search action. We are currently not debouncing the search function, but debouncing the tracking function is something we should already have.

I plan to test some diagrams with 500-1000 variables in the list and search among them to see if it makes sense to also debounce the search function to smoothen the user-experience if needed.

Checklist

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• Contribution meets our definition of done
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  • Link to related issue(s), i.e. Closes {LINK_TO_ISSUE} or Related to {LINK_TO_ISSUE}
  • Brief textual description of the changes
  • Screenshots or short videos showing UI/UX changes
  • Steps to try out, i.e. using the @bpmn-io/sr tool

[Copilot]

Pull request overview

This PR adds debounced analytics tracking for variable search interactions in the Variable Outline UI, integrating with the existing bpmn-js-tracking hook/service pattern.

Changes:

• Add a debounced variableOutline:searched tracking event when the search input is used (without sending the query).
• Add test coverage to verify debounce behavior, privacy (no term), and no-op behavior when tracking is absent.
• Add min-dash as a runtime dependency to use its debounce helper.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
package.json	Adds min-dash dependency required for debounce.
package-lock.json	Locks min-dash as a production dependency (not dev-only).
lib/components/Search/Search.jsx	Implements debounced tracking on non-empty search input changes and cancels on clear/unmount.
lib/components/Search/test/Search.spec.jsx	Adds tracking-focused tests (debounce, collapsing keystrokes, clearing, privacy, absence).
CHANGELOG.md	Documents the new feature entry.

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