Add voice dictation support

[ekishabasu1]

Summary

• add local automatic speech recognition and microphone dictation in the composer
• add dictation settings, persistence, IPC/preload plumbing, and packaged runtime support
• add draft handling and smoke coverage for the voice flow

Validation

• npm run build
• npm run smoke:shared (990 checks passed)

[FreddyJD]

Thank youu!

[FreddyJD]

@JairEsk do you want to validate on mac and windows and merge approve the PR? :)

[JairEsk]

Hi @ekishabasu1 @FreddyJD ,

Apologies for the delay on this — I was out over the weekend. :(

Thanks for putting this PR together! Really excited about this feature.

While testing the branch locally on macOS (darwin-arm64), I ran into an issue during the initial runtime setup when calling dictation:start:

Error invoking remote method 'dictation:start': Error: The runtime archive didn't contain nemo-speech.

Root Cause

It looks like there is a structural discrepancy in the upstream NeMo-Speech.cpp release archives across targets:

• Windows (.zip): Extracts directly into root (bin/nemo-speech.exe).
• macOS / Linux (.tar.gz): Wraps contents inside an enclosing top-level directory (e.g. nemo-speech/bin/nemo-speech on macOS or nemo-speech-0.1.0-*/bin/nemo-speech on Linux).

Since installRuntime() expects staging/bin/nemo-speech at the immediate root, the existence check currently fails on Unix platforms.

Suggested approach

We could dynamically resolve the inner root directory if a wrapper folder is detected after extraction:

const binaryName = process.platform === 'win32' ? 'nemo-speech.exe' : 'nemo-speech'
let contentRoot = staging

if (!(await exists(join(contentRoot, 'bin', binaryName)))) {
  const entries = await fsp.readdir(staging, { withFileTypes: true })
  const nestedDir = entries.find((e) => e.isDirectory())
  if (nestedDir && (await exists(join(staging, nestedDir.name, 'bin', binaryName)))) {
    contentRoot = join(staging, nestedDir.name)
  }
}

const expected = join(contentRoot, 'bin', binaryName)
if (!(await exists(expected))) {
  throw new Error("The runtime archive didn't contain nemo-speech.")
}

await fsp.rm(runtimeDir(), { recursive: true, force: true })
await fsp.rename(contentRoot, runtimeDir())

Let me know what you think, and I'd be happy to re-test this on macOS once updated! :) 💯 

<img width="806" height="173" alt="Captura de pantalla 2026-09-14 a la(s) 11 10 31" src="https://github.com/user-attachments/assets/be61eeb9-2ce0-4a06-8c1a-697cd2027e10" />