fix(desktop): honor rendered screenshot clipboard source

[Alx8g]

Rendered screenshot clipboard automations now use Cap's project renderer instead of silently copying the original capture.

When a screenshot trigger selects Edited / rendered, the desktop host renders its Cap project after earlier actions, so an Apply preset action is reflected in the clipboard result. Raw copies and explicit output files keep their existing behavior.

One-off project exports now load the source and configuration without starting an unused preview WebSocket and continuous preview renderer. Editor windows and editor prewarming keep the existing preview path.

Three focused source-selection tests cover raw copies, rendered projects and explicit output precedence. Rust formatting and diff checks pass. Local desktop test execution is blocked before reaching this crate because the shell cannot expose the installed Windows SDK headers to Clang while generating FFmpeg bindings. No native clipboard acceptance run was performed for this branch; CI remains the compile and test gate.

Greptile Summary

Rendered screenshot clipboard actions now render the associated Cap project, while raw copies and explicit output files preserve their existing source-selection behavior.

• Adds explicit clipboard image-source resolution with focused unit tests.
• Adds an export-only screenshot editor initialization path that avoids starting preview infrastructure.
• Routes rendered screenshot clipboard data through the existing project PNG renderer.

Confidence Score: 5/5

The PR appears safe to merge with no actionable correctness or security issues identified.

The rendered clipboard path receives PNG-encoded project output, and the export-only editor instance retains all state consumed by the renderer while omitting only unused preview infrastructure.

Important Files Changed

Filename	Overview
apps/desktop/src-tauri/src/automation.rs	Selects raw, explicit-output, or project-rendered clipboard sources and decodes rendered PNG bytes using the established clipboard path.
apps/desktop/src-tauri/src/screenshot_editor.rs	Adds a non-preview standalone instance mode while retaining every source, configuration, and dimension field consumed by one-off exports.

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[richiemcilroy]

Thanks for the pr!