feat(dashboard): link raw transcript artifacts

[christso]

Summary

• adds direct Transcript tab access to normalized transcript.json and raw transcript-raw.jsonl artifacts
• returns transcript_raw_path from the transcript endpoint only when the raw sidecar resolves locally
• shows Raw JSONL unavailable when only the normalized transcript exists

Validation

• bun ./node_modules/.bin/biome check apps/dashboard/src/components/TranscriptTimeline.tsx apps/dashboard/src/components/EvalDetail.tsx apps/dashboard/src/components/transcript-timeline.test.tsx apps/cli/src/commands/results/serve.ts apps/cli/test/commands/results/serve.test.ts
• bun test ./src/components/transcript-timeline.test.tsx ./src/components/EvalDetail.test.ts from apps/dashboard
• bun --filter agentv typecheck
• bun --filter agentv test ./test/commands/results/serve.test.ts --timeout 30000
• bun --filter @agentv/dashboard build

Browser UAT

Fixture: /tmp/agentv-dashboard-transcript-links-uat with canonical sample-1 artifact paths.

Red: origin/main on port 3129 showed only normalized transcript actions when raw-and-normalized/sample-1/transcript-raw.jsonl existed.

Green: branch on port 3128 showed Open transcript-raw.jsonl in Files and Open raw JSONL for the raw sidecar case, and Raw JSONL unavailable for the normalized-only case.

Private evidence: EntityProcess/agentv-private branch evidence/av-2s7-23-transcript-links-2026-07-05, commit 9e5045e, folder dashboard-transcript-links/.

Bead: av-2s7.23

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