feat(settings): add tab grouping opt-out

[fly1d]

Summary

• add a default-on setting to control automatic WebBrain tab grouping
• honor the opt-out for toolbar, context-menu, install, and agent-created tabs
• keep existing groups unchanged when the setting is disabled
• include the preference in config export/import
• localize the setting across all supported extension languages

Fixes #2675

Tests

• npm run test:toolbar-guard (33/33)
• npm run test:security (60/60)
• npm test (new regression passes; overall 1546 passed, 20 unrelated ENOENT failures because this sparse checkout excludes web/, docs/, and assets/)
• JavaScript syntax checks and git diff --check

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[Copilot]

Pull request overview

Adds a default-on, portable setting to disable automatic WebBrain tab grouping across Chrome and Firefox.

Changes:

• Adds the accessible setting and localized labels.
• Applies the preference to background and agent-created tabs.
• Includes the preference in config import/export and regression tests.

One non-blocking documentation issue was identified.

Reviewed changes

Copilot reviewed 54 out of 59 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/run.js	Tests preference defaults, parity, UI, config, and locales.
src/firefox/src/ui/settings.js	Loads and persists the Firefox setting.
src/firefox/src/ui/settings.html	Adds the Firefox toggle.
src/firefox/src/ui/locales/zh.js	Adds Chinese strings.
src/firefox/src/ui/locales/vi.js	Adds Vietnamese strings.
src/firefox/src/ui/locales/uk.js	Adds Ukrainian strings.
src/firefox/src/ui/locales/tr.js	Adds Turkish strings.
src/firefox/src/ui/locales/tl.js	Adds Filipino strings.
src/firefox/src/ui/locales/th.js	Adds Thai strings.
src/firefox/src/ui/locales/ru.js	Adds Russian strings.
src/firefox/src/ui/locales/pt.js	Adds Portuguese strings.
src/firefox/src/ui/locales/pl.js	Adds Polish strings.
src/firefox/src/ui/locales/nl.js	Adds Dutch strings.
src/firefox/src/ui/locales/ms.js	Adds Malay strings.
src/firefox/src/ui/locales/ko.js	Adds Korean strings.
src/firefox/src/ui/locales/ja.js	Adds Japanese strings.
src/firefox/src/ui/locales/id.js	Adds Indonesian strings.
src/firefox/src/ui/locales/hi.js	Adds Hindi strings.
src/firefox/src/ui/locales/he.js	Adds Hebrew strings.
src/firefox/src/ui/locales/fr.js	Adds French strings.
src/firefox/src/ui/locales/fa.js	Adds Persian strings.
src/firefox/src/ui/locales/es.js	Adds Spanish strings.
src/firefox/src/ui/locales/en.js	Adds English strings.
src/firefox/src/ui/locales/de.js	Adds German strings.
src/firefox/src/ui/locales/bn.js	Adds Bengali strings.
src/firefox/src/ui/locales/ar.js	Adds Arabic strings.
src/firefox/src/tab-group-preference.js	Defines the preference helper.
src/firefox/src/config-transfer.js	Adds config portability.
src/firefox/src/background.js	Guards automatic background grouping.
src/firefox/src/agent/agent.js	Guards agent-created tab grouping.
src/chrome/src/ui/settings.js	Loads and persists the Chrome setting.
src/chrome/src/ui/settings.html	Adds the Chrome toggle.
src/chrome/src/ui/locales/zh.js	Adds Chinese strings.
src/chrome/src/ui/locales/vi.js	Adds Vietnamese strings.
src/chrome/src/ui/locales/uk.js	Adds Ukrainian strings.
src/chrome/src/ui/locales/tr.js	Adds Turkish strings.
src/chrome/src/ui/locales/tl.js	Adds Filipino strings.
src/chrome/src/ui/locales/th.js	Adds Thai strings.
src/chrome/src/ui/locales/ru.js	Adds Russian strings.
src/chrome/src/ui/locales/pt.js	Adds Portuguese strings.
src/chrome/src/ui/locales/pl.js	Adds Polish strings.
src/chrome/src/ui/locales/nl.js	Adds Dutch strings.
src/chrome/src/ui/locales/ms.js	Adds Malay strings.
src/chrome/src/ui/locales/ko.js	Adds Korean strings.
src/chrome/src/ui/locales/ja.js	Adds Japanese strings.
src/chrome/src/ui/locales/id.js	Adds Indonesian strings.
src/chrome/src/ui/locales/hi.js	Adds Hindi strings.
src/chrome/src/ui/locales/he.js	Adds Hebrew strings.
src/chrome/src/ui/locales/fr.js	Adds French strings.
src/chrome/src/ui/locales/fa.js	Adds Persian strings.
src/chrome/src/ui/locales/es.js	Adds Spanish strings.
src/chrome/src/ui/locales/en.js	Adds English strings.
src/chrome/src/ui/locales/de.js	Adds German strings.
src/chrome/src/ui/locales/bn.js	Adds Bengali strings.
src/chrome/src/ui/locales/ar.js	Adds Arabic strings.
src/chrome/src/tab-group-preference.js	Defines the preference helper.
src/chrome/src/config-transfer.js	Adds config portability.
src/chrome/src/background.js	Guards background grouping; updates documentation.
src/chrome/src/agent/agent.js	Guards agent-created tab grouping.

Files not reviewed (5)

• src/chrome/src/ui/locales/bn.js: Generated file
• src/chrome/src/ui/locales/hi.js: Generated file
• src/chrome/src/ui/locales/ru.js: Generated file
• src/chrome/src/ui/locales/th.js: Generated file
• src/chrome/src/ui/locales/uk.js: Generated file

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