fix: apply BandScope desktop shell branding

[seonghobae]

Summary

• Adds local BandScope shell tokens and an accessible circular equalizer wordmark.
• Updates the desktop sidebar/local-first copy toward practical rehearsal language.
• Moves GrooveMap pitch lanes and note blocks into the dark rehearsal cockpit styling.
• Adds tests for the accessible mark, local-first copy, and dark GrooveMap transcription surface.

Closes #206.

Verification

• npm --workspace @bandscope/desktop run test (94 passed, 100% desktop line coverage)
• npm --workspace @bandscope/desktop run typecheck
• npm --workspace @bandscope/desktop run lint
• npm --workspace @bandscope/desktop run build
• npm run check:security-notes
• ./scripts/harness/quickcheck.sh

Visual QA

• Opened http://127.0.0.1:5174/ in the browser at 1440x960 and 390x844.
• Verified the accessible BandScope circular equalizer mark, primary/compact rehearsal navigation, source controls, metric cards, and empty workspace state render without visible overlap.
• Screenshots captured as bandscope-issue-206-desktop.png and bandscope-issue-206-mobile.png in the browser artifact output.

Security Notes

• No file, URL, subprocess, IPC, WebView, update, model-download, or export boundary changed in this PR.
• Brand assets are implemented as local CSS/React markup only; no remote fonts, images, screenshots, or runtime network assets were added.
• UI continues to render filenames, project labels, and transcription metadata as React text, not HTML.
• Test points: App shell tests pin the accessible wordmark/local-first copy; Workspace tests pin GrooveMap transcription rendering as a regular React text surface.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 660e3468-e9d1-43f1-a10b-d224c4bb7bdf

📥 Commits

Reviewing files that changed from the base of the PR and between 38f2b5b and 69c53d5.

📒 Files selected for processing (5)

• apps/desktop/src/App.test.tsx
• apps/desktop/src/App.tsx
• apps/desktop/src/features/workspace/GrooveMap.tsx
• apps/desktop/src/features/workspace/Workspace.test.tsx
• apps/desktop/src/index.css

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/issue-206-brand-shell

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch fix/issue-206-brand-shell

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[opencode-agent]

OpenCode Review Overview

• Head SHA: 69c53d57a7caaf619304c57e5508b8e59f465aa4
• Workflow run: 27532641865
• Workflow attempt: 1
• Gate result: APPROVE (approval step)

OpenCode Agent approved this PR.

Reviewed changes in App.test.tsx and App.tsx. The changes include updated UI text and a new logo component. The text changes improve clarity about data locality. The new BandScopeMark component is accessible. The tests were updated accordingly. Other changed files were not provided in the focused hunks, but no evidence of issues was found.

• Result: APPROVE
• Reason: No critical issues found in the reviewed changes
• Head SHA: 69c53d57a7caaf619304c57e5508b8e59f465aa4
• Workflow run: 27532641865
• Workflow attempt: 1

[opencode-agent]

OpenCode Agent approved this PR.

Reviewed changes in App.test.tsx and App.tsx. The changes include updated UI text and a new logo component. The text changes improve clarity about data locality. The new BandScopeMark component is accessible. The tests were updated accordingly. Other changed files were not provided in the focused hunks, but no evidence of issues was found.

• Result: APPROVE
• Reason: No critical issues found in the reviewed changes
• Head SHA: 69c53d57a7caaf619304c57e5508b8e59f465aa4
• Workflow run: 27532641865
• Workflow attempt: 1