fix(ci): use broad path filter for PRs, narrow for main

PRs use frontend/** to catch indirect regressions (e.g. util changes
that break component rendering). Main push uses narrow paths to avoid
unnecessary baseline rebuilds on non-UI merges.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: talissoncosta

.github/workflows/frontend-chromatic.yml

@@ -13,11 +13,7 @@ on:
   pull_request:
     types: [opened, synchronize, reopened, ready_for_review]
     paths:
-      - frontend/web/components/**
-      - frontend/web/styles/**
-      - frontend/common/theme/**
-      - frontend/documentation/**
-      - frontend/.storybook/**
+      - frontend/**
       - .github/workflows/frontend-chromatic.yml
 
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