feat(browser): enable Chrome extension compatibility (webRequest, contextMenus, debugger unblock)

[PrasannaPal21]

This PR improves Chrome extension compatibility on the browser side.

• Integrated Electron webRequest with extension layer (supports all events + blocking)
• Added support for extension context menu items in the browser
• Unblocked chrome.debugger API
• Fixed opening of chrome-extension:// URLs in proper tabs

Related: #125

peersky-browser-shell#4

[Copilot]

Pull request overview

This PR improves Chrome extension compatibility in the Electron-based browser shell by bridging missing extension APIs/behaviors into the host app (notably webRequest dispatching, context menu integration, and tab/webview registration resilience).

Changes:

• Dispatch Electron session.webRequest events into the extension layer (including blocking-capable hooks) and adjust tab/webview registration to handle guest webContents replacement.
• Integrate extension-provided chrome.contextMenus items into the browser’s native context menu.
• Unblock chrome.debugger permission and improve handling of chrome-extension:// URLs so they open as normal tabs instead of popups.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/main.js	Adds a webRequest bridge from Electron session to the extension layer across multiple events.
src/pages/tab-bar.js	Makes extension tab registration robust to webContents ID changes; adjusts popup-closing behavior on tab switches.
src/extensions/services/popup-guards.js	Redirects extension window.open() of chrome-extension:// URLs to open in a normal tab.
src/context-menu.js	Appends extension-provided context menu items into the app context menu.
src/extensions/policy.js	Removes debugger from blocked permissions to unblock chrome.debugger.
src/extensions/index.js	Minor hunk change near tab registration; logging remains in the touched area.

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

Comments suppressed due to low confidence (1)

src/pages/tab-bar.js:893

• The if (!isNewTab) { ... } block’s indentation is currently inconsistent, which makes it easy to misread the scope of what is conditional (especially around the try/catch). Please reformat this block so the conditional region is unambiguous and matches the surrounding style.

      if (!isNewTab) {
      try {
        const { ipcRenderer } = require('electron');
        ipcRenderer.invoke('extensions-close-all-popups').catch(error => {
          console.warn('[TabBar] Failed to close extension popups on tab switch:', error);

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