feat: add last synced timestamp to dashboard header (#186)

[Tannuu18]

Summary

Brief description of what this PR does.

Adds a global dashboard sync timestamp in the header so users can see how fresh their metrics are.

Closes #186

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup

Changes Made

• Added a dashboard-scoped sync context/provider to track the last successful widget fetch.
• Updated the DashboardHeader to show a muted “Synced just now” / “Synced X min ago” label.
• Added a 60-second interval so the displayed timestamp stays current.
• Kept the timestamp hidden until the first successful sync happens.

How to Test

Steps for the reviewer to verify this works:

1. Open the dashboard.
2. Wait for any widget to finish loading data.
3. Confirm the header shows a small muted sync timestamp.
4. Wait a minute and confirm the timestamp increments as expected.
5. Refresh the page and confirm the sync line stays hidden until the first fetch completes.

Screenshots (if UI change)

Checklist

• Linked issue in summary
• npm run lint passes locally
• No TypeScript errors (npm run type-check)
• Self-reviewed the diff
• Added/updated tests if applicable

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[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

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• level:intermediate — 35 pts
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[Tannuu18]

heyy @Priyanshu-byte-coder can you please review and merge the issue??

[Priyanshu-byte-coder]

Thanks @Tannuu18 for the dashboard timestamp feature! Before we can merge, we need clarification on a key architectural change:

This PR replaces <DashboardSSEProvider> with <DashboardSyncProvider> from DashboardHeader. The SSEProvider handles real-time Server-Sent Events for the dashboard. Can you explain:

1. What does DashboardSyncProvider do differently?
2. Does it still maintain the SSE connection for real-time updates?
3. Why does src/lib/supabase.ts need to be changed?

Also, the package-lock.json has many "peer": true additions — these appear to be from running a different npm version. Please ensure you run npm install with the same npm version as the project.

[Priyanshu-byte-coder]

This PR has 10 merge conflicts with current main (in src/app/dashboard/page.tsx, src/components/DashboardHeader.tsx, and src/lib/supabase.ts which have all been significantly updated). Please rebase onto current main and resolve the conflicts.

[Priyanshu-byte-coder]

Your PR has conflicts with the current main branch. Please rebase on main to resolve conflicts and this can be reviewed for merging. Labels have been added ✅

[Priyanshu-byte-coder]

This PR now has merge conflicts with main due to recent merges. Please rebase onto the latest main branch and resolve all conflicts to proceed with merging.

[Priyanshu-byte-coder]

This PR has merge conflicts with main. Please rebase your branch against the latest main and force-push to resolve. Run: git fetch upstream && git rebase upstream/main

[Priyanshu-byte-coder]

This PR has merge conflicts with the current main branch. Please rebase your branch onto main, resolve the conflicts, and force-push. Once conflicts are resolved and the PR is marked as mergeable it will be reviewed for merging.

[Tannuu18]

1. [DashboardSyncProvider] does something different from SSEProvider: it patches [window.fetch] and records a local last-synced timestamp whenever dashboard data requests succeed. That timestamp is only for the header UI in [DashboardHeader.tsx], so the user can see “synced just now” or “synced X min ago”.

2. It does not maintain the SSE connection. The real-time stream is still handled by [DashboardSSEProvider.tsx], which opens [EventSource("/api/stream")] and dispatches the devtrack:sync and [devtrack:notifications] events. In the merged result, [DashboardSSEProvider] stays around the dashboard page and [DashboardSyncProvider]is scoped to the header only.

3.[supabase.ts] needed the merge because the timestamp change also touched the public-profile lookup path. The safe merged version keeps Supabase from being initialized when env vars are missing or placeholder values, and it avoids build/runtime crashes in environments where Supabase is not configured. It also preserves the exact username lookup used by the public profile checks.