Fix #90861: preserve test drive suggestion when in: typed without value

[weilixiong]

$ #90861\n\nProblem: "Take a test drive" suggestion no longer appears when typing "in:" in search.\n\nRoot cause: PR #83138 introduced logic that auto-forces type=CHAT when an in: filter is present without an explicit type:. This correctly handles completed in: filters, but also triggers when the user typed in: with no value (autocomplete mode), suppressing onboarding suggestions.\n\nFix: Added a check ensuring in: filter has a non-empty value before forcing type=CHAT.\n\nFile: src/libs/SearchQueryUtils.ts

[melvin-bot]

@marcochavezf Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

[github-actions]

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