feat(ai): Add Live API transcriptions

[dlarocque]

Adds support for Live API transcriptions.

API Proposal: go/firebase-ai-bidi-transcripts (internal)

[changeset-bot]

🦋 Changeset detected

Latest commit: ddd6b80

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@firebase/ai	Minor
firebase	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

Vertex AI Mock Responses Check ⚠️

A newer major version of the mock responses for Vertex AI unit tests is available. update_vertexai_responses.sh should be updated to clone the latest version of the responses: v15.0

[google-oss-bot]

Size Report ¹

Affected Products

• @firebase/ai

  Type	Base (f4e46b7)	Merge (82db0d8)	Diff
  browser	64.8 kB	65.0 kB	+240 B (+0.4%)
  main	68.6 kB	68.9 kB	+240 B (+0.3%)
  module	64.8 kB	65.0 kB	+240 B (+0.4%)

• firebase

  Type	Base (f4e46b7)	Merge (82db0d8)	Diff
  firebase-ai.js	51.0 kB	51.1 kB	+114 B (+0.2%)

Test Logs

• Base (f4e46b7): https://github.com/firebase/firebase-js-sdk/actions/runs/18604182645
• Merge (82db0d8): https://github.com/firebase/firebase-js-sdk/actions/runs/18604222278

1. https://storage.googleapis.com/firebase-sdk-metric-reports/qKsJBcgG7H.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

• @firebase/ai

  • LiveGenerativeModel

    Size

    Type	Base (f4e46b7)	Merge (82db0d8)	Diff
    size	13.5 kB	13.6 kB	+120 B (+0.9%)
    size-with-ext-deps	31.2 kB	31.3 kB	+120 B (+0.4%)

  • getLiveGenerativeModel

    Size

    Type	Base (f4e46b7)	Merge (82db0d8)	Diff
    size	16.0 kB	16.1 kB	+120 B (+0.8%)
    size-with-ext-deps	33.7 kB	33.8 kB	+120 B (+0.4%)

Test Logs

• Base (f4e46b7): https://github.com/firebase/firebase-js-sdk/actions/runs/18604182645
• Merge (82db0d8): https://github.com/firebase/firebase-js-sdk/actions/runs/18604222278

1. https://storage.googleapis.com/firebase-sdk-metric-reports/6CkxcFqT3x.html