chore: upgrade @corti/sdk to 4.0.0

[Natalia Markitantova (markitosha)]

Summary

• Bump @corti/sdk from 3.0.0 to 4.0.0 in root, @corti/dictation-web, and @corti/ambient-web
• Rename ambient transcription config field isDiarization → diarize to match SDK v4

Test plan

• pnpm install
• pnpm run build
• pnpm test (11/11 pass)
• Merge and tag v0.8.0 for npm publish (current latest is 0.7.0)

[Copilot]

Pull request overview

This PR upgrades @corti/sdk to 4.0.0 across the monorepo and updates Ambient configuration to use the SDK v4 transcription field name (isDiarization → diarize).

Changes:

• Bump @corti/sdk from 3.0.0 to 4.0.0 in the root workspace, @corti/dictation-web, and @corti/ambient-web.
• Update Ambient transcription configuration to use diarize instead of isDiarization.
• Refresh pnpm-lock.yaml to reflect the new SDK version and integrity.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Updates lockfile entries/snapshots for @corti/sdk@4.0.0.
package.json	Bumps root devDependency @corti/sdk to 4.0.0.
dictation/package.json	Bumps @corti/sdk dependency to 4.0.0 for dictation package.
ambient/package.json	Bumps @corti/sdk dependency to 4.0.0 for ambient package.
ambient/src/utils/virtual-mode-config.ts	Renames transcription field to diarize when applying virtual mode config.
ambient/src/constants.ts	Renames default ambient transcription field to diarize.

Files not reviewed (1)

• pnpm-lock.yaml: Generated file

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[Natalia Markitantova (markitosha)]

Closing in favor of #50 — that PR already tracked the SDK v4 upgrade; updated there to stable @corti/sdk@4.0.0 with the diarize rename and release notes.