Implement PR 350 optimization plans

[AkaraChen]

Summary

• implements the PR 350 optimization plans across PTY restore/output, watcher coalescing, git diff/log caching, debug log batching, code splitting, resize/sidebar rendering, service-layer delegation, release profile tuning, and file-icon slimming
• removes unused OPPO font and terminal parking wrapper path
• adds focused Rust and TS tests for the changed behavior

Validation

• cd src-tauri && cargo check -p code
• cd src-tauri && cargo test -p infra
• cd src-tauri && cargo test -p service
• cd src-tauri && cargo test --test integration_git
• nr typecheck
• nr lint:check
• nr build
• nlx vitest run --environment node src/features/terminal/lib/titleDebounce.test.ts src/features/debug/debugLogStore.test.ts src/features/debug/debugStore.test.ts src/features/git/patchFiles.test.ts scripts/vite-plugin-local-file-icons.test.ts src/features/terminal/lib/liveOutputQueue.test.ts
• git diff --check

Notes

nlx vitest run src/features/terminal/Terminal.test.tsx still fails before tests execute because jsdom cannot resolve undici/lib/handler/wrap-handler.js in the current dependency tree.

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