Append a referrer param to the "Built with Reflex" badge link

[FarhanAliRaza]

Closes ENG-11714. Unblocks ENG-11623 (referral bonus).

What

The badge always links to reflex.dev — the destination is not freely settable. When the REFLEX_REFERRER_PARAM environment variable is set at compile time, its value is appended urlencoded:

https://reflex.dev/?ref=<urlencoded value>

Without the env var the badge link is unchanged (https://reflex.dev), so existing apps are unaffected.

Why this shape

Per discussion with @masenf: land it in the framework where the sticky badge is defined, keep the link pinned to reflex.dev, append only the param (if present), and urlencode it so special characters are not misinterpreted. The hosting service injects the per-owner referral identifier at build time via the env var — no user code changes.

Testing

Unit tests cover the default link, the appended param, urlencoding of special characters, and the empty-value fallback.

[greptile-apps]

Greptile Summary

The PR adds compile-time referral attribution to the fixed “Built with Reflex” badge URL while preserving the existing URL when no referral value is configured.

• Defines the optional REFLEX_REFERRER_PARAM environment variable in reflex-base.
• Percent-encodes the configured value and appends it as the badge’s ref query parameter.
• Raises the reflex-base development dependency floor and adds focused unit coverage.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
packages/reflex-base/src/reflex_base/environment.py	Adds the optional compile-time referral environment variable used by the badge.
packages/reflex-components-core/pyproject.toml	Updates the sibling-package development floor so the referenced environment attribute is available.
packages/reflex-components-core/src/reflex_components_core/core/sticky.py	Builds the fixed reflex.dev badge URL with a percent-encoded referral value when configured.
tests/units/reflex_components_core/core/test_sticky.py	Covers default, configured, encoded-special-character, and empty referral values.

_{Reviews (4): Last reviewed commit: "Update packages/reflex-components-core/p..." | Re-trigger Greptile}

[cubic-dev-ai]

No issues found across 5 files

_{Re-trigger cubic}

[codspeed-hq]

Merging this PR will not alter performance

✅ 27 untouched benchmarks
⏩ 8 skipped benchmarks¹

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_{Comparing FarhanAliRaza:farhan/eng-11714-badge-referrer-param (d90374c) with main (ceff479)}

Footnotes

1. 8 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[chatgpt-codex-connector]

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