feat(core): support ai network search

[akumatus]

Search results are streamed and appear word for word:

🎥 Video uploaded on Graphite:

Click the little globe icon to manually turn on/off Internet search:

🎥 Video uploaded on Graphite:

When there is an image, it will automatically switch to the openai model:

🎥 Video uploaded on Graphite:

[akumatus]

• feat(core): support ai network search #9357 👈 (View in Graphite)
• canary

---

How to use the Graphite Merge Queue

Add either label to this PR to merge it via the merge queue:

• merge - adds this PR to the back of the merge queue
• hotfix - for urgent hot fixes, skip the queue and merge this PR next

You must have a Graphite account in order to use the merge queue. Sign up using this link.

An organization admin has enabled the Graphite Merge Queue in this repository.

Please do not merge from GitHub as this will restart CI on PRs being processed by the merge queue.

This stack of pull requests is managed by Graphite. Learn more about stacking.

[codecov]

Codecov Report

Attention: Patch coverage is 32.70142% with 284 lines in your changes missing coverage. Please review.

Project coverage is 52.62%. Comparing base (09937a8) to head (c072c58).
Report is 8 commits behind head on canary.

Files with missing lines	Patch %	Lines
...server/src/plugins/copilot/providers/perplexity.ts	31.53%	178 Missing ⚠️
...ocksuite/presets/ai/chat-panel/chat-panel-input.ts	0.00%	25 Missing ⚠️
...ges/backend/server/src/plugins/copilot/resolver.ts	45.45%	24 Missing ⚠️
packages/backend/server/tests/utils/copilot.ts	8.00%	23 Missing ⚠️
...ages/backend/server/src/plugins/copilot/session.ts	39.13%	14 Missing ⚠️
...t-block/widgets/ai-panel/components/state/input.ts	16.66%	10 Missing ⚠️
...e/src/modules/ai-button/services/network-search.ts	11.11%	8 Missing ⚠️
...rontend/core/src/blocksuite/presets/ai/ai-panel.ts	0.00%	1 Missing ⚠️
...core/src/blocksuite/presets/ai/chat-panel/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           canary    #9357      +/-   ##
==========================================
- Coverage   52.75%   52.62%   -0.13%     
==========================================
  Files        2153     2164      +11     
  Lines       97188    97777     +589     
  Branches    16192    16239      +47     
==========================================
+ Hits        51271    51458     +187     
- Misses      44550    44921     +371     
- Partials     1367     1398      +31     

Flag	Coverage Δ
server-test	77.68% <35.92%> (-0.40%)	⬇️
unittest	32.25% <8.16%> (-0.11%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.