fix: stabilize Windows recording startup

[appergb]

Summary

• remove the Windows blur/visibility synthetic keyup fallback that was causing hold-to-talk flicker
• start the recorder without the duplicate microphone preflight so audio capture begins as early as possible
• replace Windows shell/reg subprocess calls with native APIs to avoid console window flashes
• tighten the hold-mode regression test and carry the branch on top of origin/main, including PR fix(insertion): 修正 macOS 无权限时插入状态 #92

Verification

• npm run build
• npx tsc --noEmit
• cargo test
• cargo fmt --check
• git diff --check
• npm audit --audit-level=high (no high/critical; existing moderate vite/esbuild advisory remains)

Notes

• The branch was updated onto the latest origin/main before verification; the only upstream delta was PR fix(insertion): 修正 macOS 无权限时插入状态 #92 in insertion.rs and it does not overlap with these files.
• Windows target cross-check from this mac host is still blocked by the local toolchain missing the target C headers required by ring (assert.h not found).

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