Add bulk Gmail alias generation

[hoangsvit]

Motivation

• Provide a way to generate many Gmail aliases at once from pasted tag lists to speed up workflows when creating multiple plus-addressing aliases.
• Ensure tags are cleaned, deduplicated and constrained so generated aliases are valid and predictable.

Description

• Added UI and state for bulk generation: bulkTags and generatedBulkAliases in entrypoints/popup/App.tsx.
• Added tag helpers normalizeAliasTag and parseBulkTags to sanitize, lowercase, deduplicate and limit tags.
• Implemented handleBulkGenerate to produce aliases and copyBulkAliases to copy all generated aliases and save them via saveRecentAlias, and updated handleCustomGenerate to normalize single tags.
• Inserted a Bulk Tag Generator block under the Custom Tags tab with a textarea, Generate and Copy all buttons and per-alias copy controls.

Testing

• Ran yarn compile which failed due to missing .wxt/tsconfig.json and related TypeScript lib errors.
• Ran yarn postinstall && yarn compile which failed because WXT could not resolve @wxt-dev/module-react under the current Yarn PnP environment.
• Ran yarn install which failed during postinstall for the same WXT module resolution issue.

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Codex Task

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