feat: filter campaign leads by tag

[saurabhhhcodes]

What changed

• Added campaign lead tag filtering in the lead targeting screen.
• The table now filters to the selected tag, and the bulk checkbox selects only the filtered rows.
• Added a clear-filter control and filtered-lead counts so the UI stays understandable.

Why

• The full lead list is awkward when users want to enroll a tag-specific subset.
• This makes bulk enrollment faster for large orgs with many tagged leads.

Validation

• node --check /tmp/campaign-builder-inline.js
• git diff --check

Closes #396

[coderabbitai]

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