feat: add repository filtering by stars and last activity

[Apurav-sharma]

Description

This pull request adds a new feature that allows users to filter repositories by minimum stars and/or recent activity (last commit in months) within their selected programming language.

What's Changed:

• Added minStars and lastActivity global states using Nuxt useState to keep things reactive and shared.
• Created composables/useFilteredRepositories.js which handles the logic for filtering out repositories based on the slider bounds and sorting them dynamically (most starred / recently active first).
• Added UI Sliders in components/Sidebar.vue for:
  • Minimum Stars: Dynamic slider up to 70k stars.
  • Recent Activity: Slider up to 120 months.
• Hooked the new composable up to both pages/index.vue and pages/language/[slug].vue.

AI Disclosure

This feature was built with assistance from Antigravity, an AI pair-programming assistant, and has been thoroughly tested locally using npm run dev and verified against the repository's build tools.

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