fix(studio): finish native dark-control readability in signal and firmware workflow

[masarray]

Root cause

PRs #192–#194 delivered the shared StudioDarkComboBox and StudioDarkCheckBox but left native Qt controls in the visible main signal workflow, Quality preset, and firmware serial port picker. Firmware used a second locally styled ComboBox with a Windows-native popup, creating inconsistent Windows dark contrast.

Scope

• Main: use shared themed checkbox for 3-phase link.
• SignalMatrix: use shared themed checkbox for per-channel enabled (same checked handler, no change to signal or device setpoint behavior).
• QualityEditor: use shared dark dropdown for Good / Invalid / Questionable / Test; preserve values/current-index/apply handler.
• Firmware: replace local DarkComboBox copy with the already-shared dark dropdown; preserve COM port model, refresh and firmware operation.
• Remove the now-unused local firmware dark ComboBox to maintain one styling source.

Boundaries

Qt/QML presentation only; no C++ session/controller, serial transport, firmware, SV, PTP or emitted smpSynch changes. Existing 4I+4V user flow remains intact. Exact base: main@bcbebc32.

Verification

• Confirmed all four changes in branch and compare reports exactly four QML files.
• Pending: exact-head Qt QML compile/headless launch, Windows installer preview and visual Windows screenshot check. Do not merge solely on static changes.
• Operator physical checks: right-click values/angles and PTP on/off; actual SV packet/lock tests remain separate issues M2: continuously PTP-disciplined SV timeline, truthful smpSynch and IED sync-alarm acceptance #154/M3: unified PTP–SMV context supervisor, continuous PPS↔smpCnt, dual clock authority and bounded recovery #162.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-16T10:58:25.994717Z	fe5608f	Draft marked ready

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[masarray]

Superseded by the single integration PR #195, combined head 69cae271d044b32c03cc12fceac9257c0bf75f96. All four dark-control QML changes from this PR were consolidated atomically into #195 alongside its independent SignalMatrix menu/tooltip changes. This avoids two separate main merges, duplicate integration installers, and unnecessary repeated CI. Previously green Qt and lifecycle checks were for the separate head; use #195 exact combined-head CI as the final release gate. No firmware/PTP/sampling modifications.