Add animated gradients and improve Windows desktop UI

[richiemcilroy]

Adds Animated Gradient backgrounds to both Studio editors, with 12 presets, editable color stops, motion and appearance controls, randomization, saved gradients, and remembered settings. The shared GPU renderer uses deterministic timeline animation and a bounded intermediate surface.

Improves GPUI on Windows with a native tray, window controls and dragging, app icons, shadow handling, and no console window in packaged builds. Export progress now waits until a destination file has been chosen.

Validation: desktop TypeScript and scoped Biome checks, 42 focused GPUI tests, 6 project tests, 6 persistence tests, and GPUI compilation pass. The new shader passes standalone validation; GPU regression tests and playback/export renderer timings are still running after a local compiler stall. Windows metadata checks passed, but a native Windows build and UI smoke test remain unverified.

The committed apps/desktop/src/utils/tauri.ts was generated by the existing typescript_bindings_tests::export_typescript_bindings test in apps/desktop/src-tauri/src/lib.rs, using the Specta builder with the two new Rust commands and exported library type. Re-running that generator reproduces the published file byte-for-byte; no binding additions were hand-written.

Greptile Summary

This PR adds configurable animated-gradient backgrounds across both desktop editors and shared rendering infrastructure, alongside Windows GPUI shell improvements and a revised export-file selection flow.

• Adds animated-gradient presets, editing controls, persistence, randomization, and GPU rendering.
• Adds native Windows tray, caption, icon, shadow, and window-dragging behavior.
• Keeps the generated desktop TypeScript bindings synchronized with their Rust Specta command and type sources.

Confidence Score: 5/5

The PR appears safe to merge because the previously reported generated-binding issue is resolved and no blocking failure remains.

No blocking failure remains.

Important Files Changed

Filename	Overview
apps/desktop/src-tauri/src/lib.rs	Registers the two animated-gradient commands and exported library type in the shared Specta builder used for command dispatch and TypeScript generation.
apps/desktop/src/utils/tauri.ts	Updates the committed generated bindings with commands and types corresponding to the changed Rust Specta source.
crates/project/src/animated_gradient.rs	Defines the shared animated-gradient configuration, catalog, controls, presets, and persistence-facing types.
crates/rendering/src/layers/animated_gradient.rs	Implements the shared GPU-backed animated-gradient rendering layer.
apps/desktop-gpui/src/editor_sidebar/animated_gradient.rs	Adds GPUI controls and state management for selecting and editing animated gradients.
apps/desktop/src/routes/editor/AnimatedGradientEditor.tsx	Adds the desktop editor interface for animated-gradient presets, stops, motion, and appearance.
apps/desktop-gpui/src/editor_export.rs	Introduces a file-selection phase so export progress begins only after a destination has been chosen.
apps/desktop-gpui/patches/zed-windows.patch	Extends the Windows GPUI backend to support custom frames, corrected bounds, dragging, and DPI-aware non-client insets.

_{Reviews (2): Last reviewed commit: "fix: keep gradient stop drags in one und..." | Re-trigger Greptile}

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[greptile-apps]

Generated binding edited

This directly edits a generated tauri.ts binding, so regeneration can overwrite the added commands and types or leave the committed output out of sync with its Rust source. Update the Specta source and commit output produced by the supported generation workflow instead.

Context Used: AGENTS.md (source)

Prompt To Fix With AI

This is a comment left during a code review.
Path: apps/desktop/src/utils/tauri.ts
Line: 6-11

Comment:
**Generated binding edited**

This directly edits a generated `tauri.ts` binding, so regeneration can overwrite the added commands and types or leave the committed output out of sync with its Rust source. Update the Specta source and commit output produced by the supported generation workflow instead.

**Context Used:** AGENTS.md ([source](https://github.com/capsoftware/cap/blob/main/AGENTS.md))

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	cargo/​tray-icon@​0.21.3
	cargo/​tauri-winres@​0.3.6

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[richiemcilroy]

hey @greptileai, please re-review the PR