feat(windows): add build config and stub dictation

[blueberrycongee]

Summary

This PR adds opt-in Windows build support while keeping existing macOS behavior unchanged. Default scripts (npm run tauri:dev, npm run tauri:build) and src-tauri/tauri.conf.json remain unchanged; Windows uses a separate config + scripts.

Motivation

On Windows, the app currently fails to build/package due to:

• macOS-specific window settings (overlay/transparent/effects) not mapping cleanly to Windows/WebView2
• whisper-rs pulling in bindgen which requires libclang (not present by default on Windows toolchains)

This PR makes Windows builds possible without adding new requirements like LLVM/Clang.

What changed

• Windows-only Tauri config override: src-tauri/tauri.windows.conf.json
  • Disables macOS-only window effects/overlay/transparent
  • Sets bundle.createUpdaterArtifacts=false for Windows config to avoid failing local builds due to missing TAURI_SIGNING_PRIVATE_KEY
• Windows-only build entrypoints (additive; macOS scripts unchanged): package.json
  • doctor:win
  • tauri:dev:win
  • tauri:build:win
• Dictation is disabled on Windows builds (compile-time only)
  • whisper-rs, cpal, sha2 dependencies are now non-Windows target deps in src-tauri/Cargo.toml
  • src-tauri/src/dictation_stub.rs implements the same command surface but returns a clear “not supported on Windows” error
  • src-tauri/src/lib.rs selects real dictation vs stub via cfg(target_os="windows")

How to test

Windows

• npm install
• npm run tauri:build:win (or npm run tauri:dev:win)

macOS (no behavior change expected)

• npm install
• npm run tauri:build (or npm run tauri:dev)

Notes / limitations

• Dictation/Whisper is not available on Windows in this PR (avoids requiring libclang/LLVM). If we want Windows dictation later, we can revisit with a dedicated feature flag or prebuilt bindings.
• This PR is intentionally scoped to “make native Windows packaging possible”. It does not implement remote backend mode (RFC: Optional remote backend mode (WSL2 daemon / native Windows UI) #54), but it helps establish a baseline for native Windows UI work.

Files changed

• package.json
• scripts/doctor.mjs
• src-tauri/tauri.windows.conf.json
• src-tauri/Cargo.toml
• src-tauri/src/lib.rs
• src-tauri/src/dictation_stub.rs

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 589db7b47d

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[blueberrycongee]

• macOS private APIs: tauri is now target-gated in src-tauri/Cargo.toml (macOS enables macos-private-api, non-macOS keeps features empty) so app.macOSPrivateApi: true remains supported without impacting Windows.
• Windows dictation stub: added a safety wrapper in src/features/dictation/hooks/useHoldToDictate.ts to avoid unhandled promise rejections when dictation calls reject (Windows stub or runtime failures). Errors are still surfaced via dictation events.
• Docs: added opt-in Windows build instructions + artifact locations and noted that dictation is currently disabled on Windows to avoid requiring LLVM/libclang for whisper-rs/bindgen (README.md).

[Dimillian]

Some CI failure

error: failed to run custom build command for `codex-monitor v0.1.0 (/Users/runner/work/CodexMonitor/CodexMonitor/src-tauri)`

Caused by:
  process didn't exit successfully: `/Users/runner/work/CodexMonitor/CodexMonitor/src-tauri/target/debug/build/codex-monitor-10d23dad12e35e1f/build-script-build` (exit status: 1)
  --- stdout
  cargo:rerun-if-env-changed=TAURI_CONFIG
  cargo:rustc-check-cfg=cfg(desktop)
  cargo:rustc-cfg=desktop
  cargo:rustc-check-cfg=cfg(mobile)
  cargo:rerun-if-changed=/Users/runner/work/CodexMonitor/CodexMonitor/src-tauri/tauri.conf.json
  cargo:rustc-env=TAURI_ANDROID_PACKAGE_NAME_APP_NAME=codexmonitor
  cargo:rustc-env=TAURI_ANDROID_PACKAGE_NAME_PREFIX=com_dimillian
  cargo:rustc-check-cfg=cfg(dev)
  cargo:rustc-cfg=dev

        The `tauri` dependency features on the `Cargo.toml` file does not match the allowlist defined under `tauri.conf.json`.
        Please run `tauri dev` or `tauri build` or add the `macos-private-api` feature.
      
warning: build failed, waiting for other jobs to finish...
Error: Process completed with exit code 101.

[Dimillian]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 👍

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• Mark a draft as ready
• Comment "@codex review".

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Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".