feat (overlay): add agent traces to Insights

[betegon]

Closes #807

This PR adds first-class support for AI “agent” traces, showing them under a new Agents tab in the Insights view:

New “Agents” tab

• Registers a fourth Insights tab (“Agents”) alongside Profiles, Envelopes and SDKs.
• Updates routing (AgentsTab) to render both a list view and detail panel for individual spans.

List an details views

• AITraceList component renders each AI span with a clickable link into its detail panel.
• AISpanItem shows a quick timestamped summary in the list.
• AISpanDetails opens in a side-panel and displays:
  • Operation name, span ID, relative start and duration
  • Tags, context fields (trace/parent/span/op/status)
  • Arbitrary span.data values

AI libraries support

• Adds an initial AI library registry (aiLibraries.ts) with Vercel AI SDK support.
• Added envelope fixtures under packages/overlay/_fixtures/ai_sdk/ for testing/developing.

Video demo:

https://github.com/user-attachments/assets/2e20f2b7-2efe-4fc4-b624-23d208398141

Before opening this PR:

• [x] I added a Changeset Entry with pnpm changeset:add
• [x] I referenced issues that this PR addresses

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Codecov Report

Attention: Patch coverage is 21.09745% with 834 lines in your changes missing coverage. Please review.

Project coverage is 31.31%. Comparing base (4f3e34a) to head (6ebea14). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ntry/components/insights/agents/AITraceDetails.tsx	10.06%	295 Missing :warning:
...try/components/insights/agents/sdks/vercelAISDK.ts	21.84%	279 Missing :warning:
.../sentry/components/insights/agents/AITraceList.tsx	21.77%	97 Missing :warning:
...c/integrations/sentry/data/useSpotlightAITraces.ts	15.78%	64 Missing :warning:
.../sentry/components/insights/agents/AITraceItem.tsx	20.00%	32 Missing :warning:
...try/components/insights/agents/sdks/aiLibraries.ts	33.33%	26 Missing :warning:
...lay/src/integrations/sentry/data/useSentrySpans.ts	12.00%	22 Missing :warning:
...ations/sentry/components/insights/agents/index.tsx	28.57%	10 Missing :warning:
...rc/integrations/sentry/store/slices/sharedSlice.ts	12.50%	7 Missing :warning:
.../integrations/sentry/components/insights/index.tsx	33.33%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #804      +/-   ##
==========================================
- Coverage   33.13%   31.31%   -1.82%     
==========================================
  Files         107      114       +7     
  Lines        6160     7216    +1056     
  Branches      122      122              
==========================================
+ Hits         2041     2260     +219     
- Misses       4119     4956     +837     

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[betegon]

This got way bigger than intended. We're merging this and I'll be addressing @BYK comments