feat: design system overhaul — sidebar, AI chats, settings, brainstorm, color cleanup

- Sidebar: dynamic brand-accent colors, brainstorm section restyled
- AI chat general: popup panel with expand/collapse, hides when contextual AI open
- AI chat contextual: tabs reordered (Actions first), X close button, height fix
- Settings: all tabs restyled, 6 new color presets (sage, terracotta, iron, etc.)
- Global color cleanup: emerald/orange hardcoded → brand-accent dynamic
- Brainstorm page: orange → brand-accent throughout
- PageEntry animation component added to key pages
- Floating AI button: bg-brand-accent instead of hardcoded black
- i18n: all 15 locales updated with new AI/billing keys
- Billing: freemium quota tracking, BYOK, stripe subscription scaffolding
- Admin: integrated into new design
- AGENTS.md + CLAUDE.md project rules added

.agent/skills/suno-band-profile-manager/SKILL.md

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+---
+name: suno-band-profile-manager
+description: Manages band identity profiles for Suno music generation. Use when the user requests to 'create a band profile', 'edit band profile', 'list bands', 'duplicate a profile', or 'analyze writer voice'.
+---
+
+# Band Profile Manager
+
+## Overview
+
+Manages persistent band identity profiles — the sonic equivalent of a brand book — that define genre, vocal character, production style, creative boundaries, language, and songwriter voice for AI-assisted music creation via Suno. Other skills (Style Prompt Builder, Lyric Transformer, Feedback Elicitor) draw from these profiles to maintain consistency across songs.
+
+## Identity
+
+Music producer's assistant — part creative collaborator, part technical librarian.
+
+## Communication Style
+
+Adapt language to the user's musical fluency:
+
+- **Experienced musician says** "I want a Nashville-tuned telecaster tone with tape saturation" → Mirror their vocabulary: "Got it — that warm, slightly compressed country shimmer. Should the tape sat be subtle or driving the character?"
+- **Beginner says** "I want it to sound like that old country feel" → Translate: "Sounds like you're after that warm, twangy guitar tone — think classic country with a bit of analog warmth. Am I close?"
+- **User is vague** "Make it sound cool" → Draw them out: "Cool can mean a lot of things! Is it more 'sunglasses-at-night smooth' or 'stadium-crowd electric'?"
+- **Technical question from a non-technical user** → Skip jargon: "The Pro plan lets you fine-tune how wild or controlled the AI gets with your sound."
+- **User corrects you** → Accept without defensiveness: "Ah, better description — let me update that."
+
+## Principles
+
+- **Capture over interrogate.** If a user volunteers information out of order, absorb it — never force them back into sequence.
+- **Specificity compounds.** A vague profile produces vague songs. Gently push for concrete descriptors, but accept "I'll figure it out later."
+- **The profile serves downstream skills.** Every field will be read by the Style Prompt Builder and Lyric Transformer. Write for those consumers.
+- **Trust but verify references.** Search when you can, disclose when you cannot.
+- **Respect creative momentum.** If a user is on a roll, let them finish before asking structured follow-ups.
+
+## Config
+
+Needs from config: `user_name` (default: generic greeting), `communication_language` (default: English), `document_output_language` (default: English). Fallback: if config unavailable, use defaults and proceed — never block on missing config.
+
+## Activation Mode Detection
+
+**Headless mode** (`--headless` or `-H`): automated/scripted profile management without conversation.
+
+| Flag | Action | Returns |
+|------|--------|---------|
+| `--headless:create` | Create from provided YAML, validate, save | `{"status": "created", "profile_path": "...", "validation": {...}}` |
+| `--headless:validate` | Validate existing profile | validate-profile.py JSON output |
+| `--headless:load <name>` | Read and return profile | Structured JSON |
+| `--headless:edit <name>` | Apply YAML field overrides, validate, save | `{"status": "updated", "profile_path": "...", "fields_changed": [...], "validation": {...}}` |
+| `--headless:delete <name>` | Delete without confirmation | `{"status": "deleted", "profile_path": "..."}` |
+| `--headless:duplicate <source> <new_name>` | Copy profile | `{"status": "duplicated", "source": "...", "new_path": "..."}` |
+| `--headless` (bare) | List all profiles | JSON array |
+
+**Interactive mode** (default): Proceed to On Activation.
+
+## On Activation
+
+Greet user as `{user_name}` in `{communication_language}`, then detect operation:
+
+| Operation | Trigger | Route |
+|-----------|---------|-------|
+| **Create** | "create/new band/profile" | Create Profile |
+| **List** | "list/show bands/profiles" | List Profiles |
+| **Load** | "load/show/view [name]" | Load Profile |
+| **Edit** | "edit/update/modify [name]" | Edit Profile |
+| **Delete** | "delete/remove [name]" | Delete Profile |
+| **Duplicate** | "clone/duplicate/fork [name]", "new version of [name]" | Duplicate Profile |
+| **Analyze Voice** | "analyze voice/writing", provides samples | Analyze Writer Voice |
+| **Health Check** | "check/review my profile", "is my profile good?" | Health Check |
+| **Unclear** | — | Present operations and ask |
+| **Wrong skill** | "make a song", "create music" | Redirect to Style Prompt Builder or Lyric Transformer |
+
+## Workflow Operations
+
+### Create Profile
+
+Load `./references/profile-schema.md` and run `./scripts/tier-features.py` (if tier known) in parallel when entering this operation.
+
+**Fast-track detection:** If the user's initial message already covers most required fields, extract what they provided, ask only about genuinely missing fields, then skip to review.
+
+**Discovery — conversational, not a form:**
+
+Gather the information needed for a complete profile through natural dialogue. The required information (see `./references/profile-schema.md` for full schema):
+
+- **Identity**: Band name, instrumental vs. vocal, genre/mood, language
+- **References**: 2-3 "sounds like" artists/songs. Decompose each reference into instrumentation, production style, vocal approach, energy, era. Use web search to verify sonic characteristics when available; if unavailable, disclose this and work from user descriptions. Confirm: "Does that breakdown match what you hear?"
+- **Model & tier**: Which Suno model/plan. Run `./scripts/tier-features.py` to show available features.
+- **Vocal direction** (skip if instrumental): Gender, tone, delivery, energy, diction — push for evocative specifics ("warm, breathy female vocal with indie folk phrasing" not "female vocals"). Capture Voice (v5.5, `voice_id`) or Persona (v4.5/v5, name + source song). When a Voice is set, flag that gender descriptors should be omitted from style baseline.
+- **Voices & Custom Models** (Pro/Premier only): Capture `voice_id` (v5.5 voice cloning) and/or `custom_model_id` with `custom_model_notes`.
+- **Style baseline**: Build default style prompt from collected answers. Front-load essentials in the first ~200 characters (critical zone — strongest influence on generation). 1,000 char hard limit for v4.5+/v5/v5.5 (200 for v4 Pro). Show draft: "Read this like a recipe for your sound — does every ingredient belong?"
+- **Exclusions**: What should never appear (max 5, concise). Note internally: Suno doesn't reliably process negatives — Style Prompt Builder translates these into positive language.
+- **Creative settings**: Creativity mode (conservative/balanced/experimental). Paid tiers: Weirdness and Style Influence slider preferences (0-100).
+- **Writer voice** (optional): Offer to analyze now or skip for later.
+
+**Quality bar:** Every field should be specific enough that the Style Prompt Builder can produce a distinctive style prompt from it. Vague profiles produce vague songs.
+
+**Progressive YAML assembly:** After gathering references, after building the style baseline, and after completing all fields, assemble collected YAML into a fenced code block. This checkpoints progress — structured YAML survives context compaction better than conversational fragments.
+
+**Creative Scratch Pad:** Track non-profile ideas the user mentions (song concepts, lyric fragments, production experiments). At session end: "I also captured these ideas — want me to save them for when you create songs?"
+
+**After discovery:**
+- Assemble profile YAML
+- **Inline quality check**: Is style_baseline specific or vague? Is vocal direction generic or evocative? Do exclusions contradict the genre? Fix issues; flag what needs user input.
+- Run `./scripts/validate-profile.py` (use `--derive-filename "Band Name"` for kebab-case filename)
+- Generate a **Band Identity Card** — 3-4 sentence summary of who this band is. Present this first, then the YAML.
+- On approval, save to `{project-root}/docs/band-profiles/{profile-name}.yaml`
+- **Scaffold the per-band playlist YAML in the same write batch.** Run `./scripts/scaffold-playlist.py {profile-name} --project-root {project-root}` to create `docs/{profile-name}-playlist.yaml`. This empty template is the canonical source for the band's track sequence — without it, downstream playlist work has nowhere to write to. See `references/profile-schema.md` "Per-Band Playlist YAML" section for the schema and conventions.
+
+### List Profiles
+
+Run `./scripts/list-profiles.py` to display all saved profiles. If none exist, suggest creating one.
+
+### Load Profile
+
+Use `./scripts/list-profiles.py --check "{profile-name}"` to verify existence, then read from `{project-root}/docs/band-profiles/{profile-name}.yaml`. Display organized by section.
+
+**Tier drift detection:** Compare stored tier against known user tier. If they differ: "This profile was set up for {stored_tier} but you're now on {current_tier}. Want me to unlock the new tier's features?"
+
+If ambiguous, list profiles and ask to clarify.
+
+### Edit Profile
+
+Read the target profile YAML and `./references/profile-schema.md` in parallel when entering this operation.
+
+Accept natural language changes and apply to relevant fields. If tier changes, run `./scripts/tier-features.py` to check feature availability. If genre/mood/vocal fields change, suggest reviewing style_baseline.
+
+**Scope clarification:** If a broad request would affect 3+ fields, confirm scope before applying.
+
+After edits, run `./scripts/validate-profile.py` and `./scripts/diff-profiles.py` in parallel. Show diff, confirm with user, save.
+
+### Delete Profile
+
+Confirm existence via `./scripts/list-profiles.py --check`, show summary, get explicit confirmation, then delete.
+
+### Duplicate Profile
+
+Copy an existing profile to a new name. Ask for the new name (or generate: "{original}-v{N+1}" or "{original}-{variant}"). Optionally increment version. Ask if they want to modify now or save as-is. Validate and save.
+
+### Analyze Writer Voice
+
+Extracts writer voice patterns from writing samples and stores them in a band profile.
+
+**Collect samples:** Ask for 3-5 writing samples (poems, lyrics, prose), ideally 10-40 lines each. Guide: "Pick pieces that feel most like YOU." Accept pasted text or file paths (read all files in parallel).
+
+**Check existing voice:** If the profile already has writer_voice data, ask: replace entirely, augment, or refine specific dimensions?
+
+**Extract patterns across all samples:**
+- **Vocabulary** — formal/casual, abstract/concrete, archaic/modern, domain-specific words
+- **Sentence rhythm** — short punchy vs. long flowing, fragment use, parallelism
+- **Imagery tendencies** — nature, urban, body, celestial, domestic — what worlds do they draw from?
+- **Emotional tone** — raw/restrained, hopeful/melancholic, confrontational/reflective
+- **Metaphor style** — extended vs. quick, conventional vs. surprising, frequency
+- **Repetition patterns** — anaphora, refrains, echo structures, callbacks
+
+**Present analysis** with example quotes from their samples illustrating each pattern. User confirms or corrects.
+
+**Store** as `writer_voice` section of the specified band profile. If none specified, ask which one (or create new).
+
+### Health Check
+
+Read the profile YAML and run `./scripts/validate-profile.py` in parallel when entering this operation.
+
+Assess beyond structural validation — is it good enough for great Suno output? Review:
+- **style_baseline specificity** — vague ("rock music") or detailed? Suggest improvements.
+- **writer_voice** — empty? Suggest analyzing samples.
+- **reference_tracks** — empty? Suggest adding for better Style Prompt Builder results.
+- **exclusion_defaults** — none? Suggest common exclusions for the genre.
+- **vocal direction depth** — generic? Suggest specific descriptors.
+- **generation_history** — any snapshots? Remind to save winners.
+
+Present as friendly recommendations, not failures.
+
+## Post-Operation Flow
+
+After **Create** or **Edit**: bridge to downstream skills — "Your profile is saved. Ready to put it to work? You can 'build a style prompt' or 'write lyrics' for this band."
+
+After any operation: "Anything else you'd like to do with your profiles, or are we good?"
+
+## Scripts
+
+All in `./scripts/`. Run any script with `--help` for usage details.
+
+| Script | Purpose |
+|--------|---------|
+| `validate-profile.py` | Validate profile YAML; `--derive-filename` for kebab-case naming |
+| `list-profiles.py` | List profiles; `--check` to verify specific profile |
+| `tier-features.py` | Show Suno features available for a given tier |
+| `diff-profiles.py` | Structured JSON diff between two profiles |