Fix Chrome extension error: Add missing storage permission

[Copilot]

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• Make sure you are requesting to pull a feature/bugfix branch (right side).
• Make sure you are making a pull request against the dev branch (left side). Also you should start your branch off our dev branch.
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• Make sure strings/resources are added using our resource files
• Make sure CHANGELOG.md is updated if applicable
• Make sure Smoke tests are updated if applicable

Review checklist

• Tested locally

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Description

Extension threw TypeError: Cannot read properties of undefined (reading 'local') at background.js:22:20 because chrome.storage API requires explicit permission.

Changes:

• Added "storage" to manifest.json permissions array
• Updated README.md and TECHNICAL.md to document the permission

Code usage:

// background.js:22 - Set default environment on install
chrome.storage.local.set({ 'did-environment': 'https://did.puzzlepart.com' })

// background.js:35 & sidebar.js:57,64 - Persist user's environment selection
chrome.storage.local.get(['did-environment'], callback)

Without this permission, chrome.storage is undefined.

How to test

1. Check out locally with gh
2. Open edge://extensions/ in Microsoft Edge
3. Reload the extension
4. Click extension icon - verify no console errors
5. Switch environments and reopen sidebar - verify persistence works

Related issues

Use e.g. Closes #1000 to link issue 1000 to the PR. Remove section if no related issues.

Related discussions

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Related PRs

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Related smoke tests

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Original prompt

fix error in sidebar extension functionality:

Error in event handler: TypeError: Cannot read properties of undefined (reading 'local') at chrome-extension://migfdfopbigobolgjgdmmpknlmgcfgmf/background.js:22:20
Context
Unknown
Stack Trace
:0 (anonymous function)

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