style(action): shield icon + purple colour for Marketplace branding

Swap from the default check-square/blue combo (used by most linter
Actions) to shield/purple for visual differentiation in the Marketplace
grid and to match the 'smoke detector' framing in docs/blog/.

Author: Pawansingh3889

CHANGELOG.md

@@ -16,8 +16,10 @@ _(nothing yet)_
 
 ### Added
 - **GitHub Marketplace listing** — `action.yml` now declares `author` and
-  `branding` (icon: `check-square`, colour: `blue`), plus the previously
-  CLI-only `--include-python` surfaced as an action input. Ready to
+  `branding` (icon: `shield`, colour: `purple` — safety framing, visually
+  distinct from the `check-square`/`blue` default that most linter
+  Actions use), plus the previously CLI-only `--include-python` surfaced
+  as an action input. Ready to
   publish via the Release UI's "Publish this Action to the GitHub
   Marketplace" toggle.
 - **CLI feedback CTA** — when findings are reported, the terminal

action.yml

@@ -2,8 +2,8 @@ name: 'sql-sop'
 description: 'Fast rule-based SQL linter - catches DELETE-without-WHERE, SQL injection, and 20+ other hazards in 0.08 seconds across 200 files.'
 author: 'Pawan Singh Kapkoti'
 branding:
-  icon: 'check-square'
-  color: 'blue'
+  icon: 'shield'
+  color: 'purple'
 inputs:
   paths:
     description: 'Files or directories to check'