fix: add integration icon for HACS/HA display

[Artic0din]

Summary

• Add icon.png (192x192) and icon@2x.png (512x512) to custom_components/pricehawk/
• HACS and HA look for icons at this path — they were previously only in logos/ which isn't scanned

Test plan

• HACS integration page shows PriceHawk icon instead of "icon not available"
• Settings > Devices & Services shows the icon

🤖 Generated with Claude Code

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (2)

• custom_components/pricehawk/icon.png is excluded by !**/*.png
• custom_components/pricehawk/icon@2x.png is excluded by !**/*.png

CodeRabbit blocks several paths by default. You can override this behavior by explicitly including those paths in the path filters. For example, including **/dist/** will override the default block on the dist directory, by removing the pattern from both the lists.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ad3b7d47-4cbf-41fd-9075-a70678402d6b

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/hacs-icon

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