Add idTech asset inspectors and sprite loader

Introduce dedicated idTech asset inspectors and sprite decoding support. Adds new src/formats/idtech_asset_loader.* (is_supported_idtech_asset_file, decode_idtech_asset_bytes, IdTechAssetDecodeResult) to parse SPR, SP2/SPR2, DM2, AAS and QVM metadata/summaries. Adds src/formats/sprite_loader.* to decode SPR/SP2 frame tables and images (with palette handling and animation timing).

Update image/MIP handling: decode_miptex_image now accepts a texture name and detects index-255 transparency for '{' prefixed basenames; callers (image_loader.cpp and bsp_preview.cpp) pass file names through to texture decoders. Documentation and README updated to list the new supported formats and the UI behavior for opening nested containers.

Author: themuffinator

README.md

@@ -20,8 +20,11 @@ This project is still training under the waterfall 💦🥋 (early development).
   - Audio: `wav`, `ogg`, `mp3` 🔊🎶
   - Video: `cin`, `roq`, `ogv` 🎞️🍿
   - Models: `mdl`, `md2`, `md3`, `iqm`, `md5mesh`, `lwo`, `obj` 🧊🧩
+  - Sprites: `spr`, `sp2`/`spr2` (animated sprite preview + metadata/frame table insights) 🧾🎯
+  - Demos: `dm2` (Quake II packet stream summary preview) 📼🧾
   - Maps: `bsp` (Quake/Quake II/Quake III/Quake Live) 🗺️🧭
-  - Text/config: `cfg` and similar plain-text formats 🧾🖋️
+  - Navigation/VM: `aas`, `qvm` (header/lump summary preview) 🧠📦
+  - Text/config: `cfg`, `arena`, `bot`, `skin`, `shaderlist`, and similar plain-text formats 🧾🖋️
 - Tune 3D previews with grid/floor/none options, themed/grey/custom backgrounds, and wireframe/textured toggles
 - Quake II previews honor `_glow.png` glow maps for textures and models
 - WAD support: read/extract `WAD2` and `WAD3`, rebuild/write `WAD2`
@@ -111,6 +114,7 @@ meson compile -C build
 ### GUI 🪟
 - Use **File → Open Archive…** or **File → Open Folder…** (opens in a tab).
 - Drag archives or folders onto the window to open them.
+- Double-click nested container files (`wad`, `wad2`, `wad3`, `pak`, `pk3`, `pk4`, `pkz`, `zip`) to open them in-place.
 - Drag files/folders into an open archive tab to add them.
 - Drag items out of PakFu to copy them to your file manager (exports via temp files).
 

docs/DEPENDENCIES.md

@@ -45,3 +45,13 @@
 - Cinematics (built-in decoders; used for thumbnails + playback widget):
   - CIN: id Quake II cinematic (PAL8 + optional PCM audio)
   - ROQ: id RoQ (vector quantized video + optional RoQ DPCM audio)
+
+- idTech asset inspectors (built-in metadata parsers):
+  - SPR: Quake/idTech2 sprite decode + animated preview + metadata/frame table summary
+  - SP2 / SPR2: Quake II sprite frame references resolve to animated preview + metadata/frame table summary
+  - DM2: Quake II demo packet stream summary
+  - AAS: Quake III bot navigation header + lump summary
+  - QVM: Quake III VM bytecode header + segment summary
+
+- Text/script preview:
+  - Includes Quake-style script/config assets such as `cfg`, `arena`, `bot`, `skin`, `shaderlist`, `shader`, and `menu`

src/formats/bsp_preview.cpp

@@ -2525,7 +2525,7 @@ QHash<QString, QImage> extract_bsp_embedded_textures_bytes(const QByteArray& byt
 
     const QByteArray mip_bytes = tex_lump.mid(base, static_cast<int>(slice_len));
     QString mip_err;
-    const QImage img = decode_miptex_image(mip_bytes, quake_palette, 0, &mip_err);
+    const QImage img = decode_miptex_image(mip_bytes, quake_palette, 0, name, &mip_err);
     if (!img.isNull()) {
       out.insert(name, img);
     }