fix: refresh profile metadata during background updates

[alltheseas]

Summary

• Profile metadata (kind 0) was never refreshed after initial cache - background refresh only fetched notes (kind 1)
• Added fetch_profile_metadata() that runs in parallel with note fetching
• Best-effort: failures don't block note refresh, just log warnings

Test plan

• Verified locally - stale profiles now update on page visit
• Check logs for any "failed to stream profile metadata" warnings under normal operation

Fixes #52

🤖 Generated with Claude Code

Summary by CodeRabbit

• Improvements
  • Enhanced profile loading by fetching profile metadata in parallel with profile feed data, reducing overall load time and improving responsiveness.
  • Simplified profile data retrieval by automating relay discovery internally, streamlining the data fetching process.

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[alltheseas]

There's some "Transient CI" issue

 That's a CI environment issue - Ubuntu mirror returned 404 for uuid-dev. Not related to the code changes.                                                                                  
                                                                                                                                                                                             
  Re-run the CI job - transient mirror issues usually resolve on retry. Or the CI workflow may need apt-get update before the install step.                    

[alltheseas]

@jb55 this should fix the stale profile issue reported by @sondreb

[alltheseas]

@jb55

[alltheseas]

@coderabbitai review please

[coderabbitai]

@alltheseas, I'll review the changes now.

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Review triggered.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The changes introduce parallel background fetching of profile metadata alongside the main profile feed streaming. The fetch_profile_feed function signature is simplified by removing the explicit relays parameter and deriving it internally via collect_profile_relays. A new private fetch_profile_metadata function handles metadata event processing.

Changes

Cohort / File(s)	Summary
Profile Metadata & Feed Refactoring src/render.rs	Added private async function fetch_profile_metadata to stream and process kind 0 profile metadata events with error handling and logging. Modified fetch_profile_feed signature: removed explicit relays parameter, now derives relay targets internally, and spawns fetch_profile_metadata as a parallel background task without blocking profile feed operations.

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant fetch_profile_feed
    participant collect_profile_relays
    participant fetch_profile_metadata
    participant relay_pool as relay_pool<br/>(streaming)
    participant ndb as ndb<br/>(storage)

    Caller->>fetch_profile_feed: invoke(relay_pool, ndb, pubkey)
    fetch_profile_feed->>collect_profile_relays: get relays for pubkey
    collect_profile_relays-->>fetch_profile_feed: relays
    
    par Parallel Execution
        fetch_profile_feed->>fetch_profile_metadata: spawn task(relay_pool, ndb, relays, pubkey)
        fetch_profile_metadata->>relay_pool: stream kind 0 events
        relay_pool-->>fetch_profile_metadata: metadata events
        fetch_profile_metadata->>ndb: process & store events
        fetch_profile_metadata-->>fetch_profile_metadata: error handling & logging
    and
        fetch_profile_feed->>relay_pool: stream profile feed events
        relay_pool-->>fetch_profile_feed: feed events
        fetch_profile_feed->>ndb: process feed data
    end
    
    fetch_profile_feed-->>Caller: Result (non-blocking metadata task)

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~22 minutes

Poem

🐰 A metadata refresh, oh what a treat!
Parallel streams make the profile complete,
No more stale caches that refuse to age,
Fresh data dances across the page! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: introducing profile metadata refresh during background updates.
Linked Issues check	✅ Passed	The PR successfully addresses issue #52 by implementing fetch_profile_metadata to refresh stale profile cache alongside note fetching.
Out of Scope Changes check	✅ Passed	All changes are directly related to fixing stale profile cache by adding parallel metadata refresh; no out-of-scope modifications detected.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

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📜 Recent review details

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between ad9d797 and 3ee3476.

📒 Files selected for processing (1)

• src/render.rs

🧰 Additional context used

🧬 Code graph analysis (1)

src/render.rs (1)

src/relay_pool.rs (1)

• new (29-59)

🔇 Additional comments (2)

src/render.rs (2)

361-410: Clean, best‑effort metadata refresh logic.

The new helper is scoped, handles empty relay lists, and logs errors without disrupting the main refresh flow. Looks solid for the intended “best‑effort” behavior.

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412-427: All call sites have been correctly updated to the new fetch_profile_feed signature. The three callers in src/main.rs (lines 271, 295, and 317) all pass only the three required arguments (pool, ndb, pubkey) without the relays parameter, matching the function definition at src/render.rs:412.

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