Add Microsoft Todo Task

[Muzych]

No description provided.

[Copilot]

Pull request overview

Adds a new Microsoft To Do task backend to the startpage’s task widget, integrating Microsoft Graph + Chrome Identity auth and exposing configuration/sign-in controls in Settings.

Changes:

• Introduces a microsoft-todo backend (OAuth via chrome.identity.launchWebAuthFlow, Graph list/task sync, task CRUD).
• Updates UI/settings to select the backend, configure client/tenant, and sign in/out.
• Extends Chrome extension manifest/build steps for required host_permissions, plus adds tests and documentation.

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/lib/stores/settings-store.svelte.js	Adds persisted settings fields for Microsoft To Do auth/config.
src/lib/components/Tasks.svelte	Supports microsoft-todo backend init, config handling, project list mapping, and auth-expired UX.
src/lib/components/Settings.svelte	Adds UI to configure Microsoft client/tenant and sign in/out.
src/lib/backends/microsoft-todo-backend.js	New backend: OAuth PKCE + refresh token handling + Graph sync/task operations.
src/lib/backends/microsoft-todo-backend.test.js	Unit tests for task mapping, due normalization, and sorting.
src/lib/backends/index.js	Registers the new backend in the factory/exports.
public/manifest.json	Adds Graph and AAD login host permissions for Chrome MV3.
plugins/build-manifest.js	Removes Microsoft host permissions from Firefox build output.
package-lock.json	Lockfile metadata updates (peer flags).
README.md	Documents Microsoft To Do setup steps and backend link behavior.

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[refact0r]

will review more thoroughly when i have the time, but looks pretty good.

@Muzych do i have to set anything up for this to work? for google tasks i had to make an app on gcp..