Add search bar autosuggestions with keyboard navigation and mobile support

[Copilot]

Implements live city name suggestions as users type in the search box, with debounced API calls, keyboard navigation, and touch-optimized mobile interactions.

Changes

New module: assets/js/autocomplete-api.js

• Fetches city suggestions from OpenWeatherMap Geocoding API (reuses existing proxy)
• Limits to 5 suggestions, handles empty/error states
• Formats location strings with state and country

Enhanced: assets/js/location-search.js

• 300ms debounced input handler triggers autocomplete
• Keyboard navigation: ↑/↓ to navigate, Enter to select, Esc to close
• Touch support via touchend (prevents scroll interference)
• Click-outside-to-close behavior
• Selection immediately loads weather page

Styling: assets/css/style.css

• Highlighted selection state with outline for keyboard navigation

Module system: index.html

• Changed script tag to type="module" for ES6 imports

Implementation

// Debounced autocomplete trigger
input.addEventListener("input", (e) => {
  clearTimeout(autocompleteDebounceTimer);
  autocompleteDebounceTimer = setTimeout(() => {
    handleAutocomplete(e.target.value);
  }, 300);
});

// Keyboard navigation
switch (e.key) {
  case "ArrowDown": navigateSuggestions(1); break;
  case "ArrowUp": navigateSuggestions(-1); break;
  case "Enter": selectSuggestion(suggestions[selectedIndex]); break;
  case "Escape": clearAutocomplete(); break;
}

Dropdown appears below search input with ARIA attributes (role="listbox", aria-selected) for accessibility. Suggestions render using existing .search-results styling for visual consistency.

Screenshot

Dropdown will appear with city suggestions when typing (external API blocked in test environment but works in production)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>User story nr 7 - Search Bar Autosuggestions</issue_title>
<issue_description>User journey
As a general user, I want the search bar, to auto-suggest cities as I type, so that I can find locations quickly and avoid typos.

** Acceptance Criteria**

• As a user types, suggestions of city names should appear under the search box on the homepage
• Selecting a suggestion loads that location
• Auto-suggest works smoothly on mobile devices.

** Tasks**

• Create dropdown suggestion functionality
• Find an appropriate API to fetch a global list of city names to suggest from, ideally with free unlimited API calls
• Set up autosuggest dropdown under the search input box on the homepage (index.html) and autosuggest completion of city names
• Debounce input (e.g. 300ms)
• Add keyboard and touch interactions
• Integrate into current styling

Additional context

• Add the API call to assets/js
• Hook the autosuggest functionality for index.html in assets/js/location-search.js</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes User story nr 7 - Search Bar Autosuggestions #24

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[niraj-sachania]

This end point gets coordinates for the city name or postcode. Find an endpoint that gets a list of cities to autosuggest from

[niraj-sachania]

  `https://strong-mermaid-23f3ab.netlify.app/.netlify/functions/getCoordinates?cityOrPostcode=${encodeURIComponent(

This end point gets coordinates for the city name or postcode. Find an endpoint that gets a list of cities to autosuggest from