#7121: feat(macos): update app icon OpenClaw branding

Replaced the legacy "CLAWDBOT" text to "OPENCLAW" in the macOS app icon branding. <img width="921" height="487" alt="image" src="https://github.com/user-attachments/assets/55ec4b92-5a9f-40b0-9ea8-f4d1a9dbc86c" /> The icon containing the old text is being used in the dmg installer and as app icon throughout the system. Technical Changes: - Source Asset: Replaced the old `apps/macos/Icon.icon/Assets/openclaw-mac.png` with the updated OpenClaw logo. - Icon Regeneration: Successfully regenerated the multi-resolution `apps/macos/Sources/OpenClaw/Resources/OpenClaw.icns` using the `./scripts/build_icon.sh` script. <img width="1354" height="554" alt="clawbuild (1)" src="https://github.com/user-attachments/assets/abd8ce7f-942b-42e7-8ea2-91717a89bc26" /> AI-assisted: used ai assistance in finding assets (like pngs, icns and scripts file) Any feedbacks welcome. <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR updates the macOS app icon branding by replacing the source PNG asset and regenerating the compiled multi-resolution `.icns` bundle used by the macOS app and DMG packaging. The change lives entirely in static icon assets under `apps/macos/` and does not affect application runtime code paths. <h3>Confidence Score: 5/5</h3> - This PR is safe to merge; it only updates static macOS icon assets. - Only binary asset replacements are included (PNG + ICNS) with no code changes, so functional risk is minimal; main remaining risk is purely visual/correctness of the icon output, which appears intentional per PR description. - apps/macos/Icon.icon/Assets/openclaw-mac.png; apps/macos/Sources/OpenClaw/Resources/OpenClaw.icns <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} **Context used:** - Context from `dashboard` - CLAUDE.md ([source](https://app.greptile.com/review/custom-context?memory=fd949e91-5c3a-4ab5-90a1-cbe184fd6ce8)) - Context from `dashboard` - AGENTS.md ([source](https://app.greptile.com/review/custom-context?memory=0d0c8278-ef8e-4d6c-ab21-f5527e322f13)) <!-- /greptile_comment -->