Fix query Insights errors and pagination

[no-itsbackpack]

Summary

• report missing query executions and fingerprints instead of claiming the branch is missing
• add --page and --per-page to query traffic-budget results without walking all pages
• remove the nested ls alias that intercepted insights queries ls

Test plan

• go test ./internal/cmd/insights ./internal/planetscale -count=1

[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

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[cursor]

Risk: low. Left a non-blocking comment; no reviewers were assigned. Cursor Bugbot finished as skipped with one unresolved pagination empty-state finding, so this run is not approving.

  

_{Sent by Cursor Approval Agent: cli-reviewer}