fix(css): greedy safelist for fl-button to fully restore brand red

[pftg]

Follow-up to #337 — incomplete fix

After #337 merged, production showed mixed state:

• Header "Contact Us" button: red ✓ (.btn.btn-primary rule survived)
• Hero "Talk to an Expert", card "Explore Use Cases": still blue pill ✗ (a.fl-button rule still purged)

Root cause: PurgeCSS's safelist.standard treats class-only selectors (.btn.btn-primary) and tag+class compound selectors (a.fl-button) differently. Adding fl-button to standard was enough to preserve .fl-button { ... } rules but NOT a.fl-button { ... } rules.

Fix

Move fl-button, btn, action-button from safelist.standard to safelist.greedy. Greedy preserves any rule whose selector mentions one of these classes regardless of tag prefix or compound structure.

Patterns added to greedy:

• /^fl-button/
• /^btn/
• /^action-button/

Verification

Local build inlined navigation <style> now contains:

.fl-button-wrap a, a.fl-button, a.fl-button:visited {
  background-color: #cc342d !important;
  border-radius: 8px !important;
  ...
}

This rule was missing from production after #337 (despite fl-button in standard safelist). After this PR, it survives PurgeCSS.

🤖 Generated with Claude Code

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📒 Files selected for processing (1)

• postcss.config.js

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch fix/safelist-greedy-fl-button

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