fix: trust the probe for over-budget images; TIFF allowance; build wrapper

Review of the image wave (with empirical reproduction against the
vendored image 0.25) found the budget contract did not hold across
formats: the decoder's Limits reserve checks NATIVE bytes-per-pixel,
so a grayscale/RGB JPEG/PNG/BMP over the RGBA budget decoded anyway
and into_rgba8() then ballooned to up to 4x it — the tab death the
budgets exist to prevent. The probed dimensions already prove an
OverBudget image cannot fit, so it is now refused without decoding,
removing all dependence on per-decoder limit fidelity.

Conversely, image's TIFF codec stacks ~3x scratch buffers on top of
the reserve, so an in-budget TIFF (the flagship GIS scenario) was
refused with a self-contradictory note ('400 MB, over the 512 MB
limit'); the decoder allowance for TIFF is now 3x while tier math
stays on the real budget.

Also: the refusal message saturates instead of overflowing on crafted
headers, the image pick only matches the refusal note naming ITS file
(peek, not drain — other references' notes survive for their own
drains), and the Georgian Supplement range ends at U+2D2F (U+2D30.. is
Tifinagh, which ships no font).

Build tooling: the font files missing from dist was a trunk
finalize_dist failure (Windows file-lock during the dist wipe; staging
had them, the exit code was missed) — not a copy-dir skip; it did not
reproduce in two clean cycles. scripts/build-web.sh is now the
canonical wrapper (MSYS_NO_PATHCONV, trunk, font copy + byte
verification that hard-fails), wired into README, Trunk.toml, and the
Pages workflow.

.github/workflows/pages.yml

@@ -107,7 +107,10 @@ jobs:
           tool: wasm-bindgen@${{ steps.wasm-bindgen-version.outputs.version }}
 
       - name: Build web bundle
-        run: trunk build --locked --release --public-url /app/ --dist dist/app --html-output index.html web-app.html
+        # scripts/build-web.sh runs the same Trunk build and then verifies the
+        # font set landed in dist/app/fonts, so a deploy can never silently
+        # ship without the fonts the app fetches from fonts/*.ttf.
+        run: sh scripts/build-web.sh --locked --html-output index.html web-app.html
 
       - name: Check out current website
         uses: actions/checkout@v4

README.md

@@ -173,6 +173,14 @@ Start the development server:
 trunk serve
 ```
 
+Build the deployable bundle (runs the release Trunk build, then re-syncs and
+verifies `web/fonts` in `dist/app/fonts`, so the fonts the app fetches can
+never go missing from the bundle):
+
+```bash
+sh scripts/build-web.sh
+```
+
 ## Automation
 
 The desktop binary supports one-shot conversion, a persistent headless server, and a client-neutral MCP endpoint for AI applications:

Trunk.toml

@@ -1,6 +1,6 @@
 # Trunk config for the web (wasm) build of Open CAD Studio (issue #45).
 #
-# Build:   trunk build --release
+# Build:   sh scripts/build-web.sh  (trunk build --release + fonts sync/verify)
 # Dev:     trunk serve
 #
 # Requires: rustup target add wasm32-unknown-unknown

scripts/build-web.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+# Canonical web bundle build: Trunk plus a fonts sanity sync.
+#
+# Trunk's copy-dir pipeline always copies web/fonts in full, but its final
+# "apply staging to dist" step wipes the old dist and then moves dist/app/.stage
+# into place. If that wipe fails on Windows (typically a transient lock from a
+# local file server or antivirus with a file open under dist), the build exits
+# non-zero and leaves dist stale with .stage fully populated — easy to miss,
+# and a stale bundle would 404 the fonts the app fetches from fonts/*.ttf.
+# This wrapper therefore re-syncs web/fonts into dist/app/fonts after a
+# successful Trunk build and verifies every font byte-for-byte, so a bundle
+# produced through it can never ship without the font set.
+#
+# Usage: sh scripts/build-web.sh [extra trunk build args]
+#   local:  sh scripts/build-web.sh
+#   CI:     sh scripts/build-web.sh --locked --html-output index.html web-app.html
+set -eu
+
+root=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
+cd "$root"
+
+# Git Bash rewrites leading-slash arguments such as --public-url /app/ into
+# Windows paths; keep them verbatim. Harmless on other platforms.
+MSYS_NO_PATHCONV=1
+export MSYS_NO_PATHCONV
+
+trunk build --release --dist dist/app --public-url /app/ "$@"
+
+# Mirror the font sources over the bundle and verify the copy-dir output.
+mkdir -p dist/app/fonts
+cp -f web/fonts/* dist/app/fonts/
+
+count=0
+for font in web/fonts/*.ttf; do
+    name=$(basename "$font")
+    cmp -s "$font" "dist/app/fonts/$name" || {
+        echo "error: dist/app/fonts/$name differs from $font" >&2
+        exit 1
+    }
+    count=$((count + 1))
+done
+echo "web bundle built; verified $count fonts in dist/app/fonts"

src/io/mod.rs

@@ -1900,8 +1900,13 @@ pub async fn pick_image_file() -> Result<(PathBuf, u32, u32), String> {
     let decoded = crate::scene::model::image_model::resolve_image(&reference).ok_or_else(|| {
         // An over-budget decode refusal explains itself (dims + limit);
         // anything else stays the generic unsupported/corrupt message.
-        crate::scene::model::image_model::take_decode_refusals()
-            .pop()
+        // Only a note naming THIS pick explains its failure; the queue may
+        // also hold refusals queued by concurrent re-resolution of other
+        // references, which must survive for their own drains.
+        crate::scene::model::image_model::decode_refusals()
+            .iter()
+            .find(|note| note.contains(short.as_str()))
+            .cloned()
             .unwrap_or_else(|| format!("Unsupported or corrupt image \"{short}\""))
     })?;
     // Entity sizing truth: the file's ORIGINAL pixel dimensions, not the

src/scene/model/image_model.rs

@@ -667,16 +667,34 @@ fn decode_with_budgets<R: std::io::BufRead + std::io::Seek>(
         tier_for(width, height, max_decode_bytes, max_display_pixels)
     });
 
+    // Trust the probe, not the decoder limits: `Limits::reserve` checks the
+    // decoder's NATIVE bytes-per-pixel, so a grayscale/RGB JPEG/PNG/BMP over
+    // the RGBA budget decodes fine and then `into_rgba8()` balloons to up to
+    // 4x it — exactly the tab death this exists to prevent. The probed
+    // dimensions already prove it cannot fit; refuse without decoding.
+    if tier == DecodeTier::OverBudget {
+        return DecodeAttempt::Refused {
+            width: probed.map_or(0, |(width, _)| width),
+            height: probed.map_or(0, |(_, height)| height),
+        };
+    }
+
     let mut reader = match open().and_then(|reader| reader.with_guessed_format()) {
         Ok(reader) => reader,
         Err(_) => return DecodeAttempt::Failed,
     };
-    // The decoder enforces the decode budget itself (`Limits::reserve`
-    // checks the output allocation up front), so a too-large image errors
-    // here instead of allocating first. This also RAISES the image crate's
-    // 512 MiB default on native, where the budget is 4 GB.
+    // For formats that FIT the budget, the limits still guard runaway
+    // allocations mid-decode. TIFF additionally stacks its own intermediate
+    // scratch buffers on top of the reserve (empirically ~3x the frame size
+    // in image 0.25), so refusing an in-budget TIFF at face value would
+    // produce a note claiming e.g. "400 MB, over the 512 MB limit".
+    let tiff = matches!(reader.format(), Some(image::ImageFormat::Tiff));
     let mut limits = image::Limits::default();
-    limits.max_alloc = Some(max_decode_bytes);
+    limits.max_alloc = Some(if tiff {
+        max_decode_bytes.saturating_mul(3)
+    } else {
+        max_decode_bytes
+    });
     reader.limits(limits);
     let img = match reader.decode() {
         Ok(img) => img,
@@ -747,7 +765,7 @@ fn refusal_message(path: &str, width: u32, height: u32) -> String {
         .file_name()
         .map(|name| name.to_string_lossy().into_owned())
         .unwrap_or_else(|| path.to_string());
-    let decoded_mb = width as u64 * height as u64 * 4 / (1024 * 1024);
+    let decoded_mb = (width as u64).saturating_mul(height as u64).saturating_mul(4) / (1024 * 1024);
     let limit_mb = MAX_DECODE_BYTES / (1024 * 1024);
     crate::tf!(
         "\"{name}\" is {width}×{height} px and would decode to {decoded} MB, over the {limit} MB image limit of this build — it cannot be attached. Images within the limit are attached at a reduced display resolution when needed.",
@@ -768,6 +786,17 @@ fn refusal_notes() -> &'static Mutex<Vec<String>> {
 }
 
 /// Take and clear every recorded decode refusal (most recent last).
+/// Peek without draining — callers that only want THEIR note (the pick
+/// path) must not consume refusals queued for other references.
+pub fn decode_refusals() -> Vec<String> {
+    refusal_notes()
+        .lock()
+        .unwrap_or_else(|error| error.into_inner())
+        .clone()
+}
+
+/// Take and clear — for the drains that own every queued note (the poll and
+/// the open-settle paths).
 pub fn take_decode_refusals() -> Vec<String> {
     let mut notes = refusal_notes().lock().unwrap_or_else(|error| error.into_inner());
     std::mem::take(&mut *notes)

src/scene/text/web_font.rs

@@ -244,7 +244,7 @@ pub fn script_of(ch: char) -> Option<Script> {
         0x0900..=0x097F | 0xA8E0..=0xA8FF => Script::Devanagari,
         // Georgian: Asomtavruli/Nuskhuri, Mtavruli capitals, and the legacy
         // Supplement (khutsuri round mkhedruli).
-        0x10A0..=0x10FF | 0x1C90..=0x1CBF | 0x2D00..=0x2D5F => Script::Georgian,
+        0x10A0..=0x10FF | 0x1C90..=0x1CBF | 0x2D00..=0x2D2F => Script::Georgian,
         // Hangul → always Korean; kana → always Japanese.
         0x1100..=0x11FF | 0x3130..=0x318F | 0xAC00..=0xD7A3 => Script::Korean,
         0x3040..=0x30FF | 0x31F0..=0x31FF => Script::Japanese,

web/fonts/generate.sh

@@ -56,7 +56,7 @@ sub /tmp/NotoArmenianMerged.ttf "U+0000-024F,U+1E00-1EFF,U+2000-206F,U+0530-058F
 
 dl /tmp/NotoGeorgian.ttf "$RAW/NotoSansGeorgian/hinted/ttf/NotoSansGeorgian-Regular.ttf"
 merge /tmp/NotoGeorgian.ttf /tmp/NotoGeorgianMerged.ttf
-sub /tmp/NotoGeorgianMerged.ttf "U+0000-024F,U+1E00-1EFF,U+2000-206F,U+10A0-10FF,U+1C90-1CBF,U+2D00-2D5F" georgian.ttf
+sub /tmp/NotoGeorgianMerged.ttf "U+0000-024F,U+1E00-1EFF,U+2000-206F,U+10A0-10FF,U+1C90-1CBF,U+2D00-2D2F" georgian.ttf
 
 # CJK comes from the noto-cjk repo (CFF/OTF; ttf-parser reads CFF outlines) and
 # is split by language: Simplified Chinese, Traditional Chinese, Japanese and