fix(ui): restore staged loading progress

Correct raw 1000:531e's Pascal-order BitBlt to destination (202,328), height 13, and width (stage-1)*7 from original DAT994. Render stages 2 through 35 over DAT995, add deterministic loading screenshots, and update the C harness and evidence ledger for the corrected 237x13 source.

Test Plan:
- bash original/tools/test_reconstructed_c.sh
- python3 original/tools/audit_reconstruction.py --require-complete
- cargo test --all-targets
- cargo clippy --all-targets --all-features -- -D warnings
- rumdl check original/C_RECONSTRUCTION_FINAL_AUDIT.md tdkpin-rs/CHANGELOG.md tdkpin-rs/RECONSTRUCTION.md tdkpin-rs/README.md
- cargo run --quiet -- --simulate loading --at 0.55 --screenshot /tmp/tdkpin-loading-mid.png
- git diff --check

tdkpin-rs/src/assets.rs

@@ -7,6 +7,7 @@ pub struct Assets {
     pub active_table: Texture2D,
     pub inactive_table: Texture2D,
     pub loading: Texture2D,
+    pub loading_progress: Texture2D,
     pub help: [Texture2D; 5],
     pub media: [Texture2D; 4],
     pub diamond: [Texture2D; 9],
@@ -29,6 +30,7 @@ impl Assets {
         let active_table = texture(include_bytes!("../assets/original/images/dat_00997.png"));
         let inactive_table = texture(include_bytes!("../assets/original/images/dat_00998.png"));
         let loading = texture(include_bytes!("../assets/original/images/dat_00995.png"));
+        let loading_progress = texture(include_bytes!("../assets/original/images/dat_00994.png"));
         let help = [
             texture(include_bytes!("../assets/original/images/dat_01001.png")),
             texture(include_bytes!("../assets/original/images/dat_01002.png")),
@@ -146,6 +148,7 @@ impl Assets {
             active_table,
             inactive_table,
             loading,
+            loading_progress,
             help,
             media,
             diamond,