optimize key filter

.dev/project-map.md

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+# Project Map
+_Generated: 2026-05-14 17:20 | Git-backed | Custom location requested by user_
+
+## Directory Structure
+src/app/modules/songs/ - song list, editing, display, key and transpose services.
+src/app/modules/shows/ - show list and show-song workflow.
+src/app/services/ - shared app services including filter state and search helpers.
+src/app/widget-modules/ - shared UI components and pipes.
+
+## Key Files
+src/app/modules/songs/song-list/filter/filter.component.* - sidebar filters for the song list.
+src/app/modules/songs/song-list/song-list.component.* - song list view model and filter application.
+src/app/modules/songs/services/key.helper.ts - canonical key lists, display mapping, and scale selection.
+src/app/services/filter-store.service.ts - in-memory filter state for songs and shows.
+src/app/services/filter.helper.ts - text search scoring and filtering helpers.
+
+## Critical Constraints
+- Memory markdown files are kept in `.dev/` by user request, not project root.
+- Song key data stores major keys uppercase and minor keys lowercase.
+- German notation uses `H`; `B` represents B-flat in flat spellings.
+
+## Hot Files
+src/app/modules/songs/song-list/filter/filter.component.ts, src/app/modules/songs/song-list/filter/filter.component.html, src/app/modules/songs/services/key.helper.ts

.dev/session-log.md

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+# Session Log
+
+## 2026-05-14 17:20 [saved]
+Goal: Improve song key filter readability.
+Decisions:
+- Use root-key controls with refinement because grouped enharmonic dropdowns were still awkward to change.
+- Keep memory markdown files in `.dev/` because the user requested that location.
+Rejected:
+- Keep all sharp and flat variants as separate primary options.
+- Use a grouped enharmonic dropdown that forces users through reset-like interaction.
+Open:
+- User will review the visual result.