feat: add advanced per-application audio routing

[halsatif]

Summary

• add the native OBS process-audio source backend contributed by @halsatif
• add complete per-application audio routing UI with real application icons, search, live level meters, microphone routing, and format-aware track limits
• expose routed sources as quick toggles on the main window
• preserve useful track names and show every audio track in the clip editor
• recover routed capture after process exits or restarts without stopping the replay buffer
• fix tray shutdown, startup icon/indicator, routing hover/search, and multi-track editor regressions
• prepare Captail 0.2.2 documentation, release notes, and Microsoft Store listing assets

Validation

• dotnet build Captail.sln -c Release --no-restore
• 27 process-audio foundation tests
• issue several issues found during replay/editor testing #41 regression and follow-up contracts
• startup tray/indicator contract
• all 11 localization dictionaries and protected compact layouts
• Microsoft Store workflow and listing validation
• Portable release-candidate build and real application testing

Closes #31

[FaulMit]

I integrated the maintainer-side UI and runtime fixes on top of the original process-audio backend.

What changed

• added Advanced as the third audio-track mode while keeping existing mixed and separate modes unchanged
• added an application-routing dialog with search, live audio-level meters, per-application track selection, and a separate microphone track selector
• ordered the process list as Selected, Playing audio, then Other processes
• included processes without an active audio session so routes can be prepared before an application starts playing sound
• added real executable icons with a cached asynchronous loader and initials as the fallback for protected or inaccessible processes
• made available track choices follow the selected container/audio-codec limits
• preserved and normalized routes across application and Captail restarts
• hardened process-source recovery, cleanup, and failure isolation without interrupting the replay buffer
• fixed the search-field caret/text layout and removed the flickering row-hover animation
• made OBS SDK archive verification work consistently in Windows PowerShell and GitHub Actions
• added automatic Portable artifacts for pull requests

Portable test build

Download Captail-PR-40-win-x64

Built from commit 50d766b. Extract the artifact, then extract Captail-0.2.1-Portable-win-x64.zip and run Captail.exe. GitHub sign-in may be required. The artifact is retained for 14 days.

SHA-256 for the Portable ZIP:

20d36ae4a26842f4940f399d46b57ede75871750b7dadf9db5bb4166fcfee5ff

Suggested test coverage

• route a game, Discord, browser, and media player to different tracks
• restart routed applications and confirm their routes recover
• test Chromium-family multi-process applications
• route the microphone to another track
• change container/audio codec and confirm unavailable tracks disappear
• restart Captail and confirm configuration persists
• switch back to mixed/separate modes and confirm their previous behavior is unchanged
• save a replay and verify expected tracks in the editor or a media inspector

CI passed: build, analyzers, capability model, replay routing, localization, Store workflow checks, diagnostics policy, and Portable packaging.

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: b20e73b6b1

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

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

[chatgpt-codex-connector]

Validate the process-audio plugin during test deployment

When DeployTestBuild.ps1 is run with -SkipBuild or a supplied ArtifactRoot, this required-file check can report a successful deployment even if obs-plugins\64bit\captail-process-audio.dll is absent. The deployed app then marks per-application routing as unavailable, so manual QA can unknowingly test a build without the feature; include the plugin in this validation list as the release and Store scripts already do.

Useful? React with 👍 / 👎.

[FaulMit]

Thanks @halsatif — merged and released in Captail v0.2.2. Your original process-audio backend commit remains preserved in the project history; the merged scope adds the complete routing UI, recovery, editor integration, tests, and documentation.