feat(workspace): name tonight's first harmonic function on the map

[seonghobae]

Buyer next action

The mounted rehearsal workspace now names tonight's first harmonic function so the room can lock the owned part function before rehearsal starts.

Protected base: develop@acdbea6344fe1231c39535b575f4de35e4c607c9.

What the player sees

• The callout names the owning part when an active graph node corroborates it, the owned harmony.functionLabel copy, the labeled section, and the time.
• Open scrolls the renderer-owned song-structure section and arms the next action: lock that function before the room starts.
• If no part owns rehearsal-facing function copy, the card stays guidance-only. Stay on tonight's map.

Authority boundary

• Do not invent that copy from groove, cue, simplification, overlap, range, chord labels, setup notes, confirmed overrides, harmonicExplanation, or confidence notes.
• Inherited or accessor-backed runtime metadata remains guidance-only instead of becoming navigation authority.
• Analysis section.id is never DOM-ID authority.
• Distinct from first-harmonic-explanation (feat(workspace): name tonight's first harmonic explanation on the map #1003), first-confirmed-harmony (feat(workspace): name tonight's first confirmed chord on the map #1002), first-setup-note (feat(workspace): name tonight's first setup note on the map #1004), and first-transpose (feat(workspace): name tonight's tempo, starting chord, and transpose setup #987) work.

Docs

AGENTS.md, CLAUDE.md, ARCHITECTURE.md, CHANGELOG.md, and docs/design-system/component-contract.md name this next action. Reduced-motion Open uses behavior: "auto".

Dependency / merge gate

• fix(security): establish canonical npm, PDF.js, Nanoid, and Undici baseline #783 remains the canonical protected JavaScript dependency-security owner. Inherited pdfjs-dist / nanoid / undici HIGH findings are not copied or suppressed here.
• Keep unmerged until the unchanged then-current head has every applicable repository/central CI, cross-platform build, exact owned statement+branch coverage, docstring, SAST/security/SBOM/supply-chain/package/release gate terminal-success; zero valid unresolved findings; a qualifying independent non-author last-push approval; and ordinary branch-protection acceptance.

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📥 Commits

Reviewing files that changed from the base of the PR and between acdbea6 and 6ea74e4.

📒 Files selected for processing (24)

• AGENTS.md
• ARCHITECTURE.md
• CHANGELOG.md
• CLAUDE.md
• apps/desktop/src/features/workspace/FirstHarmonicFunctionCallout.accessibility.test.tsx
• apps/desktop/src/features/workspace/FirstHarmonicFunctionCallout.particle.test.tsx
• apps/desktop/src/features/workspace/FirstHarmonicFunctionCallout.reduced-motion.test.tsx
• apps/desktop/src/features/workspace/FirstHarmonicFunctionCallout.sections-accessor.test.tsx
• apps/desktop/src/features/workspace/FirstHarmonicFunctionCallout.test.tsx
• apps/desktop/src/features/workspace/FirstHarmonicFunctionCallout.tsx
• apps/desktop/src/features/workspace/FirstHarmonicFunctionCallout.workspace-scope.test.tsx
• apps/desktop/src/features/workspace/Workspace.test.tsx
• apps/desktop/src/features/workspace/Workspace.tsx
• apps/desktop/src/features/workspace/firstHarmonicFunction.inherited-metadata.test.ts
• apps/desktop/src/features/workspace/firstHarmonicFunction.proxy-authority.test.ts
• apps/desktop/src/features/workspace/firstHarmonicFunction.test.ts
• apps/desktop/src/features/workspace/firstHarmonicFunction.time-authority.test.ts
• apps/desktop/src/features/workspace/firstHarmonicFunction.ts
• apps/desktop/src/i18n/index.test.ts
• apps/desktop/src/i18n/index.ts
• apps/desktop/src/locales/en/common.json
• apps/desktop/src/locales/ko/common.json
• docs/design-system/component-contract.md
• docs/doctoring/reduced-motion-first-harmonic-function-navigation.md

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