Improve Manage search responsiveness and selection behavior

[mdroidian]

Summary

• Switched Manage search to Roam's bounded frontend search and clear stale suggestions as the query changes.
• Kept the first Escape press in Manage mode focused on clearing the current search input.
• Updated selected rows to use Blueprint's active styling and replaced custom footer buttons with Blueprint controls.
• Added coverage for bounded search options, saved-target filtering, and result limits.

Testing

• Added unit tests for the new search flow and suggestion filtering behavior.
• Not run (not requested).

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[charliecreates]

This merged before I could submit a formal review. I reviewed the merged head c993d5b and didn’t find any high-confidence blocking issues; no review was posted after merge.

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 1 additional finding.