feat(workspace): name tonight's first simpler take on the map

[seonghobae]

Product outcome

Name tonight's first simpler take so the room can get through the section together. The mounted workspace copy names the owning part, the labeled section, and the time. Open moves to the matching rendered map section. The owned simplification hint is shown as a separate line so the next action is obvious.

Protected target: develop@749511c3ad4000090048718f685c6bee6b3d2c25 (#783 npm/PDF.js/Nanoid/Undici baseline and #957 first playable range).
Exact current head: b65160084583f09423a6d1bd0ccc3ffafb20bc4a.

This branch was rebased onto current develop. The shipped first-range callout stays. Predecessor 3736a1647ec06251214005b82552717fd8dd8b69 and its checks are historical only.

Current exact scope

• Resolve the earliest section whose unique active ranked role owns a non-empty simplification string.
• Prefer the highest rehearsal priority, then a locale-independent role id.
• Do not invent an easier pass from setupNote, cue text, overlap warnings, whitespace, inherited fields, or accessor metadata.
• Bound the hint to 180 Unicode code points and render it as a text node; never rescan it as template syntax.
• Open scrolls the renderer-owned song-structure-grid child (data-section-index). Analysis section.id is never DOM-ID authority. Reduced-motion uses behavior: "auto" against that same renderer child, not accessible copy.
• Keep the unavailable state guidance-only: stay on tonight's map until a part names an easier pass.
• Korean copy keeps dynamic role names particle-safe (파트가 / 파트와).
• Distinct from first-range, first-setup, first-lyric, first-priority, first-tag, and first-form-label work.

Merge gate

• Do not mix with 🔒 [보안] CLI 무제한 파일 읽기 취약점 수정 #811, test(analysis): govern real YouTube known-stem benchmark #828, or feat(workspace): Storybook tokens for rehearsal components #897.
• Canonical JavaScript dependency-security owner remains fix(security): establish canonical npm, PDF.js, Nanoid, and Undici baseline #783 on protected develop. This branch has no lockfile or vulnerability-suppression delta; inherited npm HIGH findings must not be suppressed here.
• Require every exact-current-head repository and central CI/security/SAST/SBOM/coverage/review gate to reach terminal success.
• Require zero valid unresolved current-head findings.
• Require a qualifying independent non-author latest-head APPROVED review.
• Never bypass branch protection, self-approve, or transfer predecessor evidence.

Queued, pending, skipped-required, failed, predecessor-head, protected-base, self/author, model-only, or administrative-bypass evidence is non-passing.

Security Notes

• Untrusted input: song, section, time-range, role, part-graph, and simplification strings.
• Trust boundary: owned data properties only; renderer-owned song-structure children are the only navigation targets.
• Safe failure: inherited/accessor/array metadata, empty hints, setup notes, cues, and overlap warnings cannot establish a simpler take.
• Privacy: no filesystem, URL, or payload contents are rendered in the callout.

[coderabbitai]

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Configuration used: Organization UI

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Run ID: 3d162342-e9e2-4d99-9f6e-64ddb73136be

📥 Commits

Reviewing files that changed from the base of the PR and between 749511c and b651600.

📒 Files selected for processing (20)

• AGENTS.md
• ARCHITECTURE.md
• CHANGELOG.md
• CLAUDE.md
• apps/desktop/src/features/workspace/FirstSimplificationCallout.particle.test.tsx
• apps/desktop/src/features/workspace/FirstSimplificationCallout.reduced-motion.test.tsx
• apps/desktop/src/features/workspace/FirstSimplificationCallout.test.tsx
• apps/desktop/src/features/workspace/FirstSimplificationCallout.tsx
• apps/desktop/src/features/workspace/Workspace.test.tsx
• apps/desktop/src/features/workspace/Workspace.tsx
• apps/desktop/src/features/workspace/firstSimplification.inherited-metadata.test.ts
• apps/desktop/src/features/workspace/firstSimplification.test.ts
• apps/desktop/src/features/workspace/firstSimplification.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
• apps/desktop/vite.config.ts
• docs/design-system/component-contract.md
• docs/doctoring/reduced-motion-first-simplification-navigation.md

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