v0.3.0

This release rewrites the backend into a modular architecture, overhauls the settings UI into routed sub-pages, fixes audio player freezing, migrates documentation to Fumadocs, and ships a batch of bug fixes targeting the most-reported issues from the tracker.

The backend's 3,000-line monolith `main.py` has been decomposed into domain routers, a services layer, and a proper database package. A style guide and ruff configuration now enforce consistency. On the frontend, settings have been split into dedicated routed pages with server logs, a changelog viewer, and an about page. The audio player no longer freezes mid-playback, and model loading status is now visible in the UI. Seven user-reported bugs have been fixed, including server crashes during sample uploads, generation list staleness, cryptic error messages, and CUDA support for RTX 50-series GPUs.

### Settings Overhaul ([#294](https://github.com/jamiepine/voicebox/pull/294))
- Split settings into routed sub-tabs: General, Generation, GPU, Logs, Changelog, About
- Added live server log viewer with auto-scroll
- Added in-app changelog page that parses `CHANGELOG.md` at build time
- Added About page with version info, license, and generation folder quick-open
- Extracted reusable `SettingRow` component for consistent setting layouts

### Audio Player Fix ([#293](https://github.com/jamiepine/voicebox/pull/293))
- Fixed audio player freezing during playback
- Improved playback UX with better state management and listener cleanup
- Fixed restart race condition during regeneration
- Added stable keys for audio element re-rendering
- Improved accessibility across player controls

### Backend Refactor ([#285](https://github.com/jamiepine/voicebox/pull/285))
- Extracted all routes from `main.py` into 13 domain routers under `backend/routes/` — `main.py` dropped from ~3,100 lines to ~10
- Moved CRUD and service modules into `backend/services/`, platform detection into `backend/utils/`
- Split monolithic `database.py` into a `database/` package with separate `models`, `session`, `migrations`, and `seed` modules
- Added `backend/STYLE_GUIDE.md` and `pyproject.toml` with ruff linting config
- Removed dead code: unused `_get_cuda_dll_excludes`, stale `studio.py`, `example_usage.py`, old `Makefile`
- Deduplicated shared logic across TTS backends into `backends/base.py`
- Improved startup logging with version, platform, data directory, and database stats
- Fixed startup database session leak — sessions now rollback and close in `finally` block
- Isolated shutdown unload calls so one backend failure doesn't block the others
- Handled null duration in `story_items` migration
- Reject model migration when target is a subdirectory of source cache

### Documentation Rewrite ([#288](https://github.com/jamiepine/voicebox/pull/288))
- Migrated docs site from Mintlify to Fumadocs (Next.js-based)
- Rewrote introduction and root page with content from README
- Added "Edit on GitHub" links and last-updated timestamps on all pages
- Generated OpenAPI spec and auto-generated API reference pages
- Removed stale planning docs (`CUDA_BACKEND_SWAP`, `EXTERNAL_PROVIDERS`, `MLX_AUDIO`, `TTS_PROVIDER_ARCHITECTURE`, etc.)
- Sidebar groups now expand by default; root redirects to `/docs`
- Added OG image metadata and `/og` preview page

### UI & Frontend
- Added model loading status indicator and effects preset dropdown ([3187344](https://github.com/jamiepine/voicebox/commit/3187344))
- Fixed take-label race condition during regeneration
- Added accessible focus styling to select component
- Softened select focus indicator opacity
- Addressed 4 critical and 12 major issues from CodeRabbit review

### Bug Fixes ([#295](https://github.com/jamiepine/voicebox/pull/295))
- Fixed sample uploads crashing the server — audio decoding now runs in a thread pool instead of blocking the async event loop ([#278](https://github.com/jamiepine/voicebox/issues/278))
- Fixed generation list not updating when a generation completes — switched to `refetchQueries` for reliable cache busting, added SSE error fallback, and page reset on completion ([#231](https://github.com/jamiepine/voicebox/issues/231))
- Fixed error toasts showing `[object Object]` instead of the actual error message ([#290](https://github.com/jamiepine/voicebox/issues/290))
- Added Whisper model selection (`base`, `small`, `medium`, `large`, `turbo`) and expanded language support to the `/transcribe` endpoint ([#233](https://github.com/jamiepine/voicebox/issues/233))
- Upgraded CUDA backend build from cu121 to cu126 for RTX 50-series (Blackwell) GPU support ([#289](https://github.com/jamiepine/voicebox/issues/289))
- Handled client disconnects in SSE and streaming endpoints to suppress `[Errno 32] Broken Pipe` errors ([#248](https://github.com/jamiepine/voicebox/issues/248))
- Fixed Docker build failure from pip hash mismatch on Qwen3-TTS dependencies ([#286](https://github.com/jamiepine/voicebox/issues/286))
- Added 50 MB upload size limit with chunked reads to prevent unbounded memory allocation on sample uploads
- Eliminated redundant double audio decode in sample processing pipeline

### Platform Fixes
- Replaced `netstat` with `TcpStream` + PowerShell for Windows port detection ([#277](https://github.com/jamiepine/voicebox/pull/277))
- Fixed Docker frontend build and cleaned up Docker docs
- Fixed macOS download links to use `.dmg` instead of `.app.tar.gz`
- Added dynamic download redirect routes to landing site

### Release Tooling
- Added `draft-release-notes` and `release-bump` agent skills
- Wired CI release workflow to extract notes from `CHANGELOG.md` for GitHub Releases
- Backfilled changelog with all historical releases