THE-9: Improve storefront reliability, empty states, and packaging

[ConduciveMammal]

Summary

• harden storefront detection and recovery paths in popup/content flow
• add clearer retryable NotFound and status states with faster storefront resolution
• add Firefox-compatible build target handling in Vite manifest generation
• add browser bundle packaging commands and output bundles to Bundled/
• remove tracked .DS_Store files and document packaging commands in README

Validation

• npm run build:dev
• npm run build:firefox:dev
• npm run package:bundle:chrome
• npm run package:bundle:firefox
• npm run package:bundle

Linear

• THE-9

[chatgpt-codex-connector]

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