refactor to load tabs in background script

[htrinter]

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[Copilot]

Pull Request Overview

This PR introduces background tab loading functionality by moving the tab opening logic from the browser action UI to a background script. Key changes include adding a new background entry in the Vite config, introducing a message-based invocation of loadSites via a new background listener, and updating tests across browser action and background modules to validate the new flow.

Reviewed Changes

Copilot reviewed 10 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
vite.config.ts	Added background entry and custom entryFileNames configuration
src/types.ts	Added type definition for communication between components
src/browseraction/components/logic/load.ts	Refactored loadSites and extracted splitInputLines for clarity
src/browseraction/components/ActionBar.vue	Switched from direct function call to message-based invocation
src/background.ts	Introduced a new background script with a loadSites listener
Various tests files	Updated tests to validate the message-based workflow

Files not reviewed (2)

• src/manifest/chrome/manifest.json: Language not supported
• src/manifest/firefox/manifest.json: Language not supported

Comments suppressed due to low confidence (2)

src/browseraction/tests/BrowserActionTabGroups.spec.ts:94

• [nitpick] Consider replacing the magic number -2 with a well-named constant to improve readability and maintainability in test expectations.

selectedTabGroupId: -2,

src/browseraction/tests/BrowserAction.spec.ts:91

• [nitpick] Consider replacing the magic number -1 with a well-named constant to clearly communicate its purpose in test expectations.

selectedTabGroupId: -1,