Prefetch and cache top 4 repos data for instant navigation

[Copilot]

Implements background prefetching of issues, PRs, workflow runs, deployments, and artifacts for the 4 most recently updated repositories on app startup. Data loads instantly from cache when navigating to repo/issue details.

Changes

• New services/prefetchService.ts: Orchestrates background data fetching

  • prefetchTopReposData(): Entry point, processes top N repos sequentially to avoid rate limits
  • prefetchRepoData(): Fetches issues, workflow runs, PR details for a single repo
  • prefetchIssueExpandedData(): Prefetches comments, related PRs, deployments, artifacts for top 5 issues
  • Configurable limits via constants: MAX_ISSUES_TO_PREFETCH, MAX_PRS_TO_PREFETCH, MAX_WORKFLOW_RUNS_FOR_ARTIFACTS

• Updated views/Dashboard.tsx: Triggers prefetch after initial repo load

  // Non-blocking background prefetch
  if (data.length > 0) {
    prefetchTopReposData(token, data, 4).catch(err => {
      console.error('Background prefetch failed:', err);
    });
  }

Existing components (RepoDetail, IssueDetail) already leverage the cache system - no changes needed. Fresh data still fetched on navigation for cache updates.

Original prompt

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This section details on the original issue you should resolve

<issue_title>on start fetch 4 top most repos issues actions prs and deployments, save them to cache so when i open repo and click issue it should be loaded instantly from cache, feel free to reorganize code</issue_title>
<issue_description>on start fetch 4 top most repos issues actions prs and deployments, save them to cache so when i open repo and click issue it should be loaded instantly from cache, feel free to reorganize code</issue_description>

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

• Fixes on start fetch 4 top most repos issues actions prs and deployments, save them to cache so when i open repo and click issue it should be loaded instantly from cache, feel free to reorganize code #32

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