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

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).

(cherry picked from commit 58d3789bcf)

Ported onto main (#1717 review): the build-web.sh wrapper and its
pages/README/Trunk wiring stay out — it works around a local Windows
trunk dist lock; the Linux Pages build is unaffected.

src/scene/text/web_font.rs

@@ -253,7 +253,7 @@ pub fn script_of(ch: char) -> Option<Script> {
         0x0E80..=0x0EFF => Script::Lao,
         // 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,