Track conversions and direct-mail Toronto visits

[xrendan]

Summary

• Report newsletter signups and voter pledges to PostHog and Google Ads, and initialize the Google Ads tag so conversion events have a configured destination.
• Filter the known browser-extension runtime.sendMessage() exception from PostHog only when its stack originates from an extension.
• Redirect /voteTO (including the trailing-slash form) to https://www.buildcanada.com/toronto/vote/2026/ with every supplied query value preserved. Add missing utm_source=direct_mail, utm_medium=offline, and utm_campaign=voteTO so PostHog can attribute untagged direct-mail visits; supplied UTM values take precedence.

Verification

• pnpm build passed.
• pnpm exec tsc --noEmit passed after the build generated Next.js types.
• ESLint passed on all changed files; git diff --check passed.
• Focused checks passed for conversion destinations, PostHog exception filtering, and redirect query preservation.
• Tested the built app over HTTP: /voteTO and /voteTO/ return 307 with the expected location; repeated/custom query parameters and supplied UTM values are preserved.

Repository-wide pnpm lint still fails on existing CSS token matches in src/components/ui/select.tsx and src/components/elections/SurveyGrid.tsx (with four unrelated ESLint warnings).

[greptile-apps]

Confidence Score: 5/5

[High risk] Adds Google Ads conversion tracking to signup and voter pledge flows.

The PR appears safe to merge; no outstanding finding or new actionable issue was identified.

Summary

The PR adds Google Ads and PostHog conversion reporting, filters a known extension-originated exception, and redirects /voteTO while preserving query values and filling in missing campaign tags.

• Since the previous review, it moves tag initialization earlier, queues conversions, restricts Ads tracking to production hosts, and updates the README.
• Greptile automatically discovered a related ticket that helped explain the purpose of this PR: tracking Toronto election pledges and member interactions.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A["/voteTO request"] --> B["Preserve query; add missing UTMs"]
  B --> C["Toronto vote page"]
  D["Successful signup or pledge"] --> E["PostHog event"]
  D --> F{"Production host?"}
  F -- Yes --> G["Queue Google Ads conversion"]
  F -- No --> H["Skip Ads conversion"]

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_{Reviews (2) · Last reviewed commit: "Queue early Ads conversions and restrict..."}