[texture] Present Canary GPUTEXTUREFORMAT names + metadata; handle XPR5

- Port xenia-canary's complete 64-entry texture-format table (xenos.h enum +
  texture_info_formats.inl) into GPU_FORMATS + gpu_format_name()/desc() and
  X360TextureFormat::gpu_name()/desc().
- Viewer + CLI `texture info` now show the canonical k_… name, bpp and
  compressed flag (e.g. "k_DXT1 (Dxt1) · 4 bpp, compressed"); UnsupportedFormat
  now names the format instead of a bare hex code.
- Detect non-XPR2 containers up front: the game ships one XPR5 file
  (Common.xpr) alongside 165 XPR2 — report UnsupportedContainer("XPR5")
  cleanly instead of a "bad magic" parse error.
- Add a table-integrity test (index==code, spot-checks, decodable-variant
  consistency).

Static-RE scan of the 166 resource3d XPRs: only k_DXT1 (145), k_8_8_8_8 (19),
k_DXT5A (1) are used — all already decoded, so this is presentation, not new
decoders.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/sylpheed-viewer/src/iso_loader.rs

@@ -1993,7 +1993,19 @@ fn apply_loaded_texture(
     let w = tex.width;
     let h = tex.height;
     let mips = tex.mip_levels;
-    let fmt_str = format!("{:?}  {}×{}  {} mip(s)", tex.format, w, h, mips);
+    // Canary-sourced format name + metadata (GPUTEXTUREFORMAT), e.g.
+    // "k_DXT1 (Dxt1) · 256×256 · 9 mip(s) · 4 bpp, compressed".
+    let d = tex.format.desc();
+    let fmt_str = format!(
+        "{} ({:?})  ·  {}×{}  ·  {} mip(s)  ·  {} bpp, {}",
+        tex.format.gpu_name(),
+        tex.format,
+        w,
+        h,
+        mips,
+        d.bpp,
+        if d.compressed { "compressed" } else { "uncompressed" },
+    );
 
     let image = match crate::asset_loader::x360_texture_to_bevy_image(tex) {
         Ok(img) => img,