[codex] UX: move profiles into companion header popup

[jqmwa]

Summary

This UX update moves the profile/character selection flow out of the old dedicated character surface and into the companion header as a centered Profiles popup beside Voice and New Chat.

What changed

• removed the old character-mode shell entry from the active UI flow
• added a new Profiles popup in the companion/header controls
• rendered 8 bundled profiles in a wider modal with larger cards
• added short profile bios and color-coded plugin badges
• featured richer plugin stacks in the top 4 profiles
• raised the modal above persistent shell/scratch overlays so it stays visible

UX impact

• profile selection is now available from the primary chat surface instead of a separate page
• the popup is easier to scan, with more readable copy and badges that do not crush the card layout
• the interaction is more discoverable for users already working in the companion shell

Validation

• bun run verify ❌ fails due to existing repo-wide packages/agent type errors unrelated to this change
• bunx tsc -p packages/app-core/tsconfig.json --noEmit ❌ still resolves into those same existing packages/agent errors
• bun run verify:lint ✅
• bun run build ✅
• bun run test ❌ fails in existing unrelated suites:
  • packages/app-core/test/utils/parse-xml-unicode.test.ts
  • packages/app-core/test/app/i18n.test.ts
  • packages/app-core/test/app/inventory-bsc-view.test.ts
  • test/app/public-assets.test.ts
• bun run test:e2e ❌ fails in existing unrelated suites and then hangs in teardown:
  • packages/agent/test/agent-orchestration.e2e.test.ts
  • packages/app-core/test/app/onboarding-full-journey.e2e.test.ts
  • packages/app-core/test/app/pages-navigation-smoke.e2e.test.ts
  • packages/app-core/test/app/shell-mode-switching.e2e.test.ts
  • packages/agent/test/browser-workspace-agent-chat.e2e.test.ts

Notes

This PR was isolated onto a clean branch from upstream/develop so it does not include the unrelated history currently present on dex/v3.

[github-actions]

Agent Review — Service Unavailable

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• Claude: failure
• Codex (fallback): failure

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