tauri frontend

[biscoe916]

Summary

Adds a Tauri-based desktop frontend (OPUS-tauri-app/) alongside a product specification (docs/tauri-product-spec.md) for the Workset desktop app. Also hardens git command environment isolation and expands env-bootstrap overrides in the Go backend.

Context

• The Tauri app is a new React + Rust frontend intended to replace the existing Wails + Svelte UI. It implements the core app shell (4-column layout, icon rail, top chrome), Command Center, Spaces (terminal/agent tabs with diff right-panel), and Settings pages, backed by a Rust layer with PTY management, diff engine, session daemon communication, and GitHub integration.
• The product spec (docs/tauri-product-spec.md) is a working document that defines the mental model (Workset/Workspace/Branch), information architecture, and page-level behavior.
• Go changes harden non-interactive git execution (GIT_TERMINAL_PROMPT=0) and expand the env-bootstrap override list (HOME, USER, LOGNAME, GIT_ASKPASS, XDG vars) with an increased login-env timeout (2s -> 5s) to improve reliability in automated workflows.

Validation

• go test ./internal/git/... ./pkg/worksetapi/... — new tests pass for git env hardening and env-snapshot overrides.
• Tauri app builds and runs locally (`cd OPUS-tauri-app && npm i; npm run tauri dev).
• Existing make test suite unaffected.

Risks and Rollout

• New directory (OPUS-tauri-app/): Large addition (~15k LOC); no impact on existing Wails UI or Go CLI — purely additive.
• Env-bootstrap changes: Expanding the override list and increasing the timeout could affect edge-case shell environments. Mitigated by new test coverage.
• Spec is a working draft: tauri-product-spec.md will evolve; merging it now establishes a shared reference point.

Review Checklist

• Tests were added/updated for behavior changes.
• User-facing docs were updated if behavior changed.
• Breaking behavior (if any) is documented clearly.
• If touching large/complex areas, I included rationale and a decomposition follow-up when appropriate.

[greptile-apps]

Too many files changed for review. (156 files found, 100 file limit)