docs: 0.3.0 release notes with screenshots and GIFs

docs/releases/0.3.0.md

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+# DroidDeck 0.3.0 (beta)
+
+**Steam the way a Steam Deck runs it.** Deck mode is the default, Steam's performance overlay works with real Adreno stats, games keep running behind the Quick Access Menu, and the Steam client sees your handheld as a Steam Deck controller.
+
+![Turning Steam's performance overlay up to level 4 from Quick Access while Alan Wake's American Nightmare keeps playing](media/0.3.0/mangohud-level4.gif)
+
+**Needs:** Android 9+, Adreno 730 or newer (or 8xx), ~3 GB free for the runtime (+1.1 GB for Desktop & apps).
+
+Updating from 0.2.0 keeps your settings: Deck mode only turns itself on for new installs. From 0.3.0 on, DroidDeck updates itself from the new **Updates** page.
+
+---
+
+## Highlights
+
+### Steam, as on a Steam Deck
+Deck mode is now on for new installs. Steam's performance overlay goes from level 1 to 4 in Quick Access and shows GPU and CPU load, clocks, temperatures, VRAM and battery, even on phones that lock those files away. The game keeps running behind the Quick Access Menu and the Steam menu, as above, and Quick Access shows battery life and time to full.
+
+![Performance overlay at level 4 over Alan Wake's American Nightmare](media/0.3.0/mangohud-level4.jpg)
+
+### A Steam Deck controller
+In Steam sessions the client reads your pad as a Steam Deck controller, with a real Quick Access button and your handheld's gyro. Games get Steam Input's virtual pads, so your Steam Input layouts reach them. On a dual-screen handheld, the second screen can be the Deck's back grips and trackpads.
+
+<p>
+<img src="media/0.3.0/deck-controls.jpg" width="40%" alt="Second screen showing both Deck trackpads and the L4, L5, R5 and R4 grips">
+</p>
+
+### Faster to Steam, faster in games
+Steam's own startup is down from about 31 seconds to about 6, and that makes **Offline mode** work. proot no longer stops on the calls games make most, and there's a new per-mode frame limiter.
+
+### GPU drivers that set themselves
+A new **GPU drivers** tab detects your GPU and keeps a matched pair of runtime and display drivers installed for it, including DroidDeck's own DD-Turnip builds. Switch to **Manual** to pick a pair yourself.
+
+![Components GPU drivers tab on an Adreno 740, set to Auto](media/0.3.0/gpu-drivers.jpg)
+
+### Linux apps from Flathub, or bring your own
+Turn on the **Flathub Store** in Setup to install ARM64 apps and games from Flathub. They open full screen from the front end with your controller. The Desktop page also takes your own apps: a script, an AppImage, a GitHub repo's newest ARM64 AppImage, or a Flatpak ID.
+
+<p>
+<img src="media/0.3.0/store-app.jpg" width="49%" alt="Space Cadet Pinball's page in the Flathub Store">
+<img src="media/0.3.0/add-app.jpg" width="49%" alt="Adding Zen Browser from its GitHub repo, with icons suggested from the repo">
+</p>
+
+### Updates in the app
+The **Updates** page installs new builds without leaving DroidDeck: **Stable**, **Preview** (each build of main) or a **Test build** of an open pull request. Every download is checked against its checksum and DroidDeck's release key before Android sees it.
+
+![Updates page with the Stable, Preview and Test builds channels](media/0.3.0/updates.jpg)
+
+### A front end that moves as one
+One focus ring slides between controls, settings flood out of the cog the way Play floods into a session, and Stop asks before it ends anything. DroidDeck is also available in Spanish.
+
+<p>
+<img src="media/0.3.0/focus-ring.gif" width="59%" alt="Moving the focus ring with a D-pad, opening Steam settings from the cog and backing out">
+<img src="media/0.3.0/stop-confirm.jpg" width="39%" alt="The Stop confirmation growing out of the Stop button in the session menu">
+</p>
+
+---
+
+## Everything in 0.3.0
+
+### Steam
+
+- Steam's startup down from about 31 s to about 6 s, so Offline mode works (@xXJSONDeruloXx, #69)
+- Deck mode on for new installs, always on the Steam Deck client branch so Steam stops offering a downgrade (@xXJSONDeruloXx, #100, #101)
+- Steam's performance overlay (MangoHud), levels 1–4, with Adreno GPU, CPU, VRAM and temperature stats, and a switch to turn it off (@xXJSONDeruloXx, #55, #101)
+- The overlay keeps running and filled in under an enforcing SELinux policy, as on retail phones (@xXJSONDeruloXx, #127)
+- Games keep running behind the Quick Access Menu and the Steam menu (@xXJSONDeruloXx, #131)
+- A game that minimized itself behind the Steam menu comes back on Resume (@The412Banner, #89)
+- Quick Access shows battery life and time to full (@xXJSONDeruloXx, #117)
+- Steam shuts down cleanly when you stop a session, so it keeps its caches (@xXJSONDeruloXx, #68)
+- Games you own in a second library or games folder become real Steam games instead of shortcuts (@maxjivi05, #62)
+- Imported games keep their installed build, so Steam doesn't re-verify them (@maxjivi05, #108)
+- Launch options on added games are kept between sessions (@xXJSONDeruloXx, #111)
+- Choose the host name Steam sees (@magarto, #61)
+- Stretch 16:9 games onto screens narrower than 16:9, such as foldables (opt-in) (@magarto, #63)
+
+### Controls
+
+- Steam Deck controller for the Steam client: a real Quick Access button, the handheld's gyro, and Steam Input's virtual pads for games (@xXJSONDeruloXx, #86)
+- Deck back grips and trackpads on the second screen (@xXJSONDeruloXx, #86)
+- Xbox 360 controller option, with the right axis layout for games that have Steam Input off (@xXJSONDeruloXx, #86, #102)
+- The Steam client finds the Deck controller under an enforcing SELinux policy (@xXJSONDeruloXx, #125)
+- Touch scrolls Steam on phones with no controller at start (@xXJSONDeruloXx, #123)
+- Quick Access from Back comes sooner, and no longer opens the focused game under load (@xXJSONDeruloXx, #70, #73)
+- Shift and Caps Lock type capitals (@xXJSONDeruloXx, #71)
+- Adaptive sticks hide when idle and appear where you touch (@maxjivi05, #53)
+
+### Display and performance
+
+- GPU drivers tab: Auto keeps a matched runtime and display pair for your GPU, Manual lets you pick one (@xXJSONDeruloXx, #103)
+- DD-Turnip, DroidDeck's own driver bundles (@maxjivi05, #106)
+- Adreno 840v2 (retail SM8850) works with the runtime's own driver (@xXJSONDeruloXx, #93)
+- Setup says when a GPU is untested (Adreno 6xx, 710, 720, 722) (@xXJSONDeruloXx, #103)
+- LSFG takes Lossless Scaling from your Steam library by itself, adds 60, 90 and 120 fps targets, and paces generation to the game's frames (@maxjivi05, #96, #129)
+- Per-mode frame limiter, live panel refresh, opt-in GPU clock pin and Mesa's database shader cache (@maxjivi05, #87)
+- proot stops less often: kompat, fake_id0 and ioctl traps trimmed, and common path lookups answered in-process (@xXJSONDeruloXx, @maxjivi05, #81, #84, #113)
+- Turnip's GPU timestamp polls answered without blocking (@maxjivi05, #87)
+- Cheaper defaults: Steam's xalia helper skipped, gamescope's realtime queue off, microphone off (@xXJSONDeruloXx, #85)
+- Per-game environment variables, now in an editor that works with a pad (@maxjivi05, @xXJSONDeruloXx, #60, #140)
+
+### Apps and desktop
+
+- Flathub Store: ARM64 Flatpak apps and games, opened full screen from the front end and listed on the Desktop page (@xXJSONDeruloXx, #77)
+- Add your own apps to the Desktop page: a script, an AppImage, a GitHub repo or a Flatpak ID, with icons and update checks (@maxjivi05, #130)
+- The desktop hands its cursor to the app, so full-screen games skip a compositing pass (@xXJSONDeruloXx, #57)
+
+### Launcher
+
+- Updates page: Stable, Preview and Test builds, installed in the app and verified first (@xXJSONDeruloXx, #98, #112, #115)
+- Game saves: import and export GameHub and Winlator save zips for added games (@The412Banner, #91)
+- One focus ring slides between controls, settings flood out of the cog, and focus returns to what opened a page (@xXJSONDeruloXx, #105, #140)
+- Stop asks first, and quitting floods back into the launch button (@xXJSONDeruloXx, #72, #105)
+- Spanish, with every screen's text moved to translatable strings (@xXJSONDeruloXx, #140)
+- Pair wireless debugging from a notification to lift Android's child-process limit (@xXJSONDeruloXx, #67)
+
+### Sessions and logs
+
+- Session folders are named by day, number and mode, the newest 30 are kept, and Setup has **Clear logs** (@xXJSONDeruloXx, #122)
+- Shared logs carry controller and touch-mode details for input reports (@xXJSONDeruloXx, #125)
+
+### Fixed
+
+- Steam sessions failing to start with the app on adopted SD storage (@xXJSONDeruloXx, #119)
+- Second-library games failing to launch or install their dependencies (@xXJSONDeruloXx, #134)
+- Steam's own installs on a second library showing up as non-Steam shortcuts (@xXJSONDeruloXx, #138)
+- A white veil left after closing the session menu (@xXJSONDeruloXx, #135)
+- Update channel cards flashing as a controller moved over them (@xXJSONDeruloXx, #99)
+- Flatpak installs failing (@maxjivi05, #82)
+- gamescope respawning a crashing overlay every second (@xXJSONDeruloXx, #81)
+
+### Behind the scenes
+
+- Every signed main build is published to DroidDeck-CI and posted to Discord, in every package variant (@xXJSONDeruloXx, @The412Banner, #56, #59, #78, #92)
+- Pull requests from this repo get a signed test build automatically; forks with the `publish-test` label (@xXJSONDeruloXx, #94, #97, #114, #116, #120, #124, #139)
+- One update catalog feeds the Updates page (@xXJSONDeruloXx, #115)
+- Faster local builds that can sign with DroidDeck's key (@xXJSONDeruloXx, #58, #85)
+- Discord badge and community section in the README (@xXJSONDeruloXx, #104)