ui: runtime-scaled layout for 640x480 and 720x720 displays

docs/development-status.md

@@ -6,7 +6,7 @@ Milestone 3 — SDL Video Viewport, HUD, and Wayland Compatibility
 
 ## Current Architecture Decisions
 
-- **Language / UI**: Python 3.9+ with PySDL2 (ctypes wrapper around system SDL2)
+- **Language / UI**: Python 3.9+ with PySDL2 (ctypes wrapper around system SDL2), with UI layout metrics now computed from the runtime window/display size instead of being fixed to 640x480
 - **DLNA Discovery**: Custom SSDP M-SEARCH implementation using asyncio datagrams + aiohttp for device description XML
 - **Content Browsing**: Direct SOAP/XML ContentDirectory client with DIDL-Lite parser (no dependency on async-upnp-client browsing at runtime — only aiohttp)
 - **Playback**: integrated GStreamer backend via `PyGObject` / `GstPlayBin`, decoding video into `GstAppSink` frames that are uploaded to SDL textures and rendered in the main SDL renderer
@@ -25,7 +25,7 @@ Milestone 3 — SDL Video Viewport, HUD, and Wayland Compatibility
 
 - Phase 1: Project bootstrap (`pyproject.toml`, `requirements.txt`, `README.md`, package layout under `src/`)
 - Phase 2: DLNA discovery (`dlna/discovery.py` — SSDP M-SEARCH, friendly-name fetch) and browsing (`dlna/client.py` — SOAP Browse, DIDL-Lite parser with relative-URL resolution + `dlna/models.py` domain models + `dlna/browser_state.py` navigation stack/cache)
-- Phase 3: SDL2 UI (`ui/sdl_app.py` — window, event loop, input dispatch; `ui/screens.py` — server list, browse list, playback, error screens; `ui/theme.py` — 640×480 layout constants)
+- Phase 3: SDL2 UI (`ui/sdl_app.py` — window, event loop, input dispatch; `ui/screens.py` — server list, browse list, playback, error screens; `ui/theme.py` — runtime-scaled layout helpers for 640x480 and 720x720-class displays)
 - Phase 4: Playback (`player/backend.py` abstract interface + `player/gstreamer_backend.py` integrated GStreamer backend)
 - Phase 5: Device integration (`platform/controls.py` — keyboard + gamecontroller mapping; `platform/runtime.py` — logging, R36S heuristic, SDL env hints)
 - Phase 7: Tests — 75 tests across 7 test files all passing (DIDL mapping, SOAP/XML parser, navigation state, playback backend, SDL redraw policy, input controls, runtime environment setup)
@@ -39,6 +39,7 @@ Milestone 3 — SDL Video Viewport, HUD, and Wayland Compatibility
 - Playback HUD expanded: progress bar, elapsed/duration, volume, buffer, resolution, and control legends are rendered around the video area and updated from GStreamer bus/pipeline queries
 - Playback-page flashing root cause addressed by removing native overlay composition entirely: video and HUD are now rendered together by SDL in one pass, with redraws driven by decoded frame availability and HUD state changes
 - Playback HUD simplified: the border around the video area was removed, playback control/status icons were added as bundled SVG+PNG assets, the title/timer top bar no longer overlaps, and playback now supports `auto / fixed / hidden` HUD modes through a dedicated command while staying visible when paused
+- UI scaling hardened for mixed small-display targets: list rows, HUD bands, icon sizes, viewport margins, and font sizes are now derived from the actual SDL window/display size so the app remains readable on both 640x480 and 720x720 screens
 - Deployment assets added: `.gitignore`, `environment.yml`, and a real `LICENSE` file so the project can be initialized and published as a clean git repository
 - Conda environment refreshed for current playback needs: runtime now includes GStreamer codec/plugin packages plus explicit Python build/test tooling, while editable install keeps the package code sourced from the repo checkout
 - Packaging fix: `pyproject.toml` now uses a valid TOML `[project.urls]` table so editable installs work with modern `pip` / `tomllib`
@@ -52,7 +53,7 @@ Milestone 3 — SDL Video Viewport, HUD, and Wayland Compatibility
 - Validate real video playback on the physical R36S after adding the missing H.264 and AAC decoder plugins to the device conda env
 - Device deployment on the physical R36S is now wired through ArkOS `Ports -> MatHacks`, with the heavy runtime under `/home/ark` and only a lightweight stub launcher under `/roms/ports`
 - Device env bootstrap on the physical R36S reaches a clean `from r36s_dlna_browser.app import Application` inside `/home/ark/miniconda3/envs/r36s-dlna-browser`
-- ArkOS launcher asset added at `deploy/arkos/MatHacks.sh` with the verified `LD_LIBRARY_PATH`, `GST_PLUGIN_SCANNER`, and `GST_PLUGIN_SYSTEM_PATH_1_0` exports needed by the conda runtime
+- ArkOS launcher asset added at `deploy/arkos/MatHacks.sh`; current launcher uses the `/home/ark/R36SHack` checkout plus verified `LD_LIBRARY_PATH`, `GST_PLUGIN_PATH`, and `LD_PRELOAD` exports needed to load the system `gstreamer1.0-libav` plugins from the conda runtime
 
 ## Blockers Or Open Questions