The XML loader reads each template level, as 1.12.1 does (#1892)

The XML loader merged a template chain into one element, losing each attribute's level: `setAllPoints` lost to a template's `<Anchors>`, an empty `text=` wiped a template's text, the template's `<TexCoords>` won.

1.12.1 never merges: each loader re-enters on `inherits` (`0x76fe36`, `0x770f9e`, `0x76985c`), then reads its own node's attributes and first children (`0x6f2c50`).

Now regions load per level in `0x770f40`'s order; frames read geometry, `frameLevel`, StatusBar attributes and button text per level. A failed texture fills green (`0x878d24`). Level tests cover each rule; the stock load is unchanged but for the AddOns window's crops.

Fixes #1534
Fixes #1548
Fixes #1547
Fixes #1866
Fixes #1423
Fixes #1858
Fixes #1424
Fixes #1472
Fixes #1861
Fixes #1859
Fixes #1171
Fixes #1860
Fixes #1817

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/DEVIATIONS.md

@@ -634,8 +634,8 @@ Each entry is the first sentence of a `Deviation:` comment, linking to where it
 
 #### loader
 
-- A `<Script file=>` value with a separator joins the including document's directory, like a bare name. ([`src/loader/mod.rs:370`](../crates/benilla-ui/src/loader/mod.rs#L370))
-- Padded to the block's line, so a raise reports a line a reader can find in the file; the reference counts from the body's first line. ([`src/loader/mod.rs:396`](../crates/benilla-ui/src/loader/mod.rs#L396))
+- A `<Script file=>` value with a separator joins the including document's directory, like a bare name. ([`src/loader/mod.rs:429`](../crates/benilla-ui/src/loader/mod.rs#L429))
+- Padded to the block's line, so a raise reports a line a reader can find in the file; the reference counts from the body's first line. ([`src/loader/mod.rs:455`](../crates/benilla-ui/src/loader/mod.rs#L455))
 
 #### markup