Add autocomplete search and improve navbar UI

[josbeir]

Adds an Alpine.js-powered autocomplete search dropdown and extracts layout components into reusable CakePHP elements with proper test coverage.

Changes

Autocomplete search

• New /autocomplete JSON endpoint in PackagesController returning package name, description, stats, and version info
• findAutocomplete() custom finder on PackagesTable using the existing FriendsOfCake/Search plugin with name-match relevance sorting (packages matching by name rank above description-only matches)
• Alpine.js packageSearch component with debounced fetch, keyboard navigation (↑↓/Enter/Escape), and AbortController for cancelling stale requests
• Responsive dropdown: fixed positioning on mobile, absolute on desktop; non-essential UI hidden on small screens

UI refactoring

• Extracted search form into element/search.php and navbar into element/navbar.php, simplifying the default layout
• New UserHelper with username(), displayName(), avatarUrl(), and avatar() methods — replaces inline identity logic in templates
• Professional navbar with GitHub avatar dropdown for logged-in users and a compact sign-in button for guests

Tests

• UserHelperTest — 12 tests covering all helper methods for logged-in/logged-out states
• PackagesTableTest — 8 tests for the findAutocomplete finder (matching, limit, priority, ordering, tag containment)
• PackagesControllerTest — 5 integration tests for the autocomplete endpoint (JSON structure, short/missing/no-match queries, result limit)

[Copilot]

Pull request overview

This PR adds an autocomplete-powered global package search and refactors the navbar/search UI into reusable CakePHP elements, backed by new helper logic and test coverage.

Changes:

• Added /autocomplete JSON endpoint plus PackagesTable::findAutocomplete() finder for ranked, limited search results with tag containment.
• Introduced Alpine.js packageSearch component and extracted navbar/search markup into templates/element/* elements, with a new UserHelper for identity display.
• Expanded fixtures and added/updated tests for the helper, finder, and controller endpoint.

Reviewed changes

Copilot reviewed 15 out of 17 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
tests/TestCase/View/Helper/UserHelperTest.php	Adds unit tests for UserHelper helper methods.
tests/TestCase/Model/Table/PackagesTableTest.php	Adds tests for the new findAutocomplete() finder and tag containment.
tests/TestCase/Controller/PackagesControllerTest.php	Adds integration tests for /autocomplete JSON endpoint behavior.
tests/Fixture/PackagesFixture.php	Extends fixture data to support autocomplete ranking tests.
templates/layout/default.php	Replaces inline navbar/search markup with element('navbar').
templates/element/search.php	Adds global search form element with Alpine-powered autocomplete dropdown.
templates/element/navbar.php	Adds new navbar element incorporating the search element and user menu.
src/View/Helper/UserHelper.php	Introduces helper for username/display name/avatar rendering.
src/View/AppView.php	Loads the new User helper globally.
src/Model/Table/PackagesTable.php	Implements findAutocomplete() finder with ranking + limits + tags.
src/Controller/PackagesController.php	Adds autocomplete() action and allows unauthenticated access to it.
resources/js/app.js	Adds Alpine.js autocomplete client logic and starts Alpine.
resources/css/style.css	Adds [x-cloak] styling for Alpine templates.
package.json	Adds Alpine.js dependency.
package-lock.json	Locks Alpine.js and transitive dependencies (and updates package name field).
config/routes.php	Enables JSON extension parsing and connects /autocomplete.
config/Migrations/schema-dump-default.lock	Adds schema dump lock artifact.

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