refactor(web): remove pointer-follow glow effect

[bobleer]

Summary

• Remove the pointer-follow glow runtime, global pointer listeners, overlay styles, preference hook, and tests.
• Remove the Appearance toggle, localized copy, search metadata, and generated product-control capability.
• Clean up glow-specific DOM attributes and rename the remaining generic settings-section surface prop.

Type and Areas

Type: UI/UX / refactor

Areas: web UI, i18n, docs, interactive capability catalog

Motivation / Impact

The pointer-follow glow is no longer part of the product. This removes the feature instead of only hiding its setting, so the app no longer installs its global pointer/scroll/resize listeners or creates the overlay.

Verification

• pnpm --dir src/web-ui run test:run src/infrastructure/config/components/AppearanceSettingsPage.test.tsx src/infrastructure/config/components/common/ConfigPageLayout.test.tsx src/app/scenes/settings/settingsRegistry.test.ts src/app/components/AgentCompanionDesktopPet/AgentCompanionDesktopPet.test.tsx — 29 tests passed
• pnpm run i18n:audit
• pnpm run capabilities:check
• pnpm run capabilities:test — 14 tests passed
• pnpm run motion:audit
• pnpm run check:web:appearance
• pnpm run type-check:web
• pnpm run check:repo-hygiene
• git diff --check

Reviewer Notes

• AI-assisted: yes. Testing level: fully tested for the affected shared Web UI paths.
• Screenshots are not included because the UI control and runtime effect were removed without a replacement surface.
• Remote Workspace, Remote Control, Peer Device Mode, and Detached Dispatch were not exercised separately; this change does not alter commands, protocols, or transport behavior.

Checklist

• This PR is focused and does not include secrets, temporary prompts, generated scratch files, or unrelated artifacts.
• Relevant verification is recorded above, or skipped checks are explained.
• User-facing strings, docs, and locales are updated where applicable.