Remove mentions of contacting Roo Code support

[roomote]

Remove all user-facing references to contacting Roo Code support (support@roocode.com) from the extension.

Changes

Settings About page (About.tsx)

• Removed the "Need to talk to us? Write support@roocode.com" contact section
• Renamed section header from "Contact & Community" to "Community"
• Removed unused MessageCircle icon import

Chat error handling (ChatRow.tsx)

• Removed mailto:support@roocode.com link from unknown API error handler

Diagnostics (diagnosticsHandler.ts)

• Replaced "Please share this file with Roo Code Support (support@roocode.com)" header with generic "This file contains error diagnostics for troubleshooting."

Localization (18 locales)

• Removed "Please contact Roo Code support" from unknown API error messages in all chat.json files
• Removed contact translation object and renamed contactAndCommunity to communityHeader in all settings.json files

Tests

• Removed contact section test from About.spec.tsx
• Updated diagnostics header assertion in diagnosticsHandler.spec.ts

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[roomote]

Rooviewer   See task

Reviewed all 41 changed files. No issues found.

The changes are clean and consistent: support contact references removed from About page, ChatRow error handler, and diagnostics header. All 18 locale files properly updated (removed contact object, renamed contactAndCommunity to communityHeader, trimmed unknown error messages). Tests updated accordingly. No stale references remain in the extension codebase.

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