[FEATURE] Save last searched repository to localStorage

[ascender1729]

Description

Remember the last searched repository and pre-fill it on next visit.

Why Needed

• Users often search same repos repeatedly
• Saves typing on return visits
• Improves user experience

Implementation Details

• Save repo URL to localStorage on successful search
• Load saved repo on page load
• Clear saved value when user clears input
• Handle invalid/deleted repos gracefully

Files to Modify

• src/components/results/ResultsContainer.svelte
• src/lib/storage.ts (if exists, or create)

Code Example

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Acceptance Criteria

• Last searched repo saved on search
• Input pre-filled on page load
• Works across browser sessions
• Graceful fallback if localStorage unavailable

Time Estimates

• With AI: 75 minutes
• Without AI: 500 minutes