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-style-prompt-builder/references/README.md

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+# Style Prompt Builder
+
+The Style Prompt Builder generates model-aware Suno style prompts optimized for the user's chosen model tier, blending band profile baselines with per-song creative direction. It understands the fundamental differences between Suno model families — v4.5 wants conversational descriptions while v5 wants crisp film-brief descriptors — and produces a complete prompt package: style prompt, exclusion prompt, slider recommendations, and an optional experimental wild card variant. The skill enforces the 1,000-character limit (200 for v4 Pro) and prioritizes the critical first 200 characters where Suno's attention is strongest.
+
+## When to Use Directly vs. Through Mac
+
+Use this skill directly when you already have a band profile or clear musical direction and just need a style prompt built. Use Mac (the orchestrating agent) when style prompt creation is part of a larger workflow that includes profile setup, lyric transformation, or post-generation feedback refinement.
+
+## Operations
+
+### Interactive Mode (default)
+
+1. **Gather Inputs** — Collects song direction, band profile, model selection, creativity mode (conservative/balanced/experimental), and specific requests
+2. **Build Style Prompt** — Constructs model-specific prompt with critical zone awareness; decomposes reference tracks into concrete descriptors (never puts artist names in prompts)
+3. **Build Exclusion Prompt** — Generates "Exclude Styles" content from profile defaults, user requests, and genre inference
+4. **Slider Recommendations** — Weirdness, Style Influence, and Audio Influence settings based on creativity mode and tier
+5. **Wild Card Variant** — Experimental alternative that pushes creative boundaries
+6. **Validate & Present** — Character count validation, copy-ready output blocks, refinement loop
+
+### Headless Mode (`--headless` or `-H`)
+
+- `--headless:from-profile` — Generate prompt package using only profile baseline
+- `--headless:custom` — Generate from provided parameters without a profile
+- `--headless:refine` — Apply structured adjustments from the Feedback Elicitor to an existing prompt
+- `--headless:migrate` — Reformat an existing prompt from one model's style to another
+- `--headless` with profile name — Hybrid mode (profile baseline + overrides)
+
+## Scripts
+
+| Script | Description |
+|--------|-------------|
+| `validate-prompt.py` | Validates style prompt character count (model-specific limits), critical zone content, and structure |
+
+## Example Invocation
+
+```
+# Interactive
+"Build a style prompt for my midnight-echoes profile"
+"Create a Suno prompt for a dreamy indie folk song on v5 Pro"
+
+# Headless
+--headless:from-profile --profile midnight-echoes
+--headless:custom --model v5-pro --genre "indie folk" --mood "dreamy, introspective"
+--headless:migrate --prompt "warm indie rock..." --from v4.5-pro --to v5-pro
+```
+
+## Creativity Modes
+
+| Mode | Behavior | Weirdness Range |
+|------|----------|-----------------|
+| **Conservative** | Genre-pure descriptors, proven combinations | 20-35 |
+| **Balanced** (default) | Standard approach, some distinctive touches | 40-60 |
+| **Experimental** | Unexpected fusions, unusual descriptors | 65-85 |
+
+## Supported Models
+
+| Model | Prompt Style | Character Limit |
+|-------|-------------|-----------------|
+| v4.5-all / v4.5 Pro / v4.5+ Pro | Conversational, flowing sentences | 1,000 |
+| v5 Pro | Crisp, 5-8 film-brief descriptors | 1,000 |
+| v5.5 Pro | Same as v5 Pro, more expressive + Voices/Custom Models | 1,000 |
+| v4 Pro | Simple, straightforward descriptors | 200 |
+
+## Part of the Suno Band Manager Module
+
+This skill is part of the Suno Band Manager module and works with any LLM CLI supporting the [Agent Skills](https://agentskills.io) standard. For the full guided experience, invoke Mac — the orchestrating agent — instead of using this skill directly.