Web: wasm back under the 24 MiB gate with ~1 MiB headroom (25.38 -> 24.17 MB)

The "web build and wasm size gate" job failed on main and every PR: the
release `_bg.wasm` measured 25,379,677 bytes at 8d49ecf5, over the
25,165,824-byte limit in packaging/web/package.sh.

- egui's default fonts (Ubuntu Light, Hack, Noto Emoji, emoji-icon-font)
  were embedded uncompressed (1.4 MB) by egui's `default_fonts` feature.
  The app now builds egui without it; ui-egui's build.rs deflates the
  same files from the `epaint_default_fonts` crate (a build-dependency,
  so no font files are committed) and `egui_fonts.rs` rebuilds egui's
  exact default stack from them on first use. Test builds keep the
  feature as the oracle: the rebuilt definitions equal egui's byte for
  byte.
- Translation catalogs: every catalog repeated the same English sources.
  build.rs now stores the `context<TAB>source` keys once and each catalog
  as references plus translations, losslessly (`text()` still returns
  each .tsv byte for byte; malformed lines are kept as they are).
- wasm-release profile: opt-level "z" for PhotoCraft's own crates.
  Dependencies stay at "s" (at "z" the wasm grew 0.4 MB, measured), the
  file-decoding crates (codecs, psd, raw, heif, vector) stay at "s" and
  the pixel crates at 3, so decoding and filters keep their speed.

Measured with `trunk build --release` (trunk 0.21.14, wasm-opt v123 -Oz):
  upstream main 8d49ecf5      25,379,677 bytes
  this change                 24,167,186 bytes (-1,212,491)
  gate                        25,165,824 bytes (998,638 headroom)

Co-Authored-By: Claude Opus 5.5 <[email protected]>

Cargo.toml

@@ -50,7 +50,9 @@ zune-core = "0.5"
 zune-jpeg = "0.5"
 proptest = "1"
 eframe = { version = "0.36", default-features = false }
-egui = "0.36"
+# Without `default_fonts`, which embeds egui's fonts uncompressed: ui-egui ships them deflated
+# (egui_fonts.rs; the web build's size gate).
+egui = { version = "0.36", default-features = false }
 egui_kittest = "0.36"
 rfd = "0.17"
 log = "0.4"
@@ -81,13 +83,14 @@ codegen-units = 1
 
 # The browser build (apps/photocraft-web, `data-cargo-profile` in its index.html). Hosts cap the
 # size of a single file (Cloudflare Pages/Workers: 25 MiB), and the wasm is downloaded on every
-# visit, so this profile optimizes for size: fat LTO, opt-level "z" for the UI, command, and I/O
-# shells, and "s" for other crates except pixel processing, which keeps opt-level 3. panic
-# stays the target default (wasm32-unknown-unknown aborts; AGENTS.md's `panic = "unwind"` is for
-# the native app shell). packaging/web/package.sh fails the build above 24 MiB.
+# visit, so this profile optimizes for size: fat LTO, opt-level "z" for PhotoCraft's own crates,
+# "s" for dependencies and for the crates that decode files, and 3 for pixel processing (filters
+# and compositing). Dependencies stay at "s": at "z" the whole wasm grows (by 0.4 MB, measured).
+# panic stays the target default (wasm32-unknown-unknown aborts; AGENTS.md's `panic = "unwind"`
+# is for the native app shell). packaging/web/package.sh fails the build above 24 MiB.
 [profile.wasm-release]
 inherits = "release"
-opt-level = "s"
+opt-level = "z"
 lto = "fat"
 codegen-units = 1
 strip = "debuginfo"
@@ -95,20 +98,19 @@ strip = "debuginfo"
 [profile.wasm-release.package."*"]
 opt-level = "s"
 
-# Keep the browser shell compact as shared panel controls grow. Pixel-processing crates below
-# retain their speed-oriented optimization level.
-[profile.wasm-release.package.photocraft-ui-egui]
-opt-level = "z"
-
-# Keep browser command dispatch, import/export glue, and the entry point compact. Native
-# builds and the speed-oriented pixel-processing overrides below retain their settings.
-[profile.wasm-release.package.photocraft-engine]
-opt-level = "z"
-[profile.wasm-release.package.photocraft-io]
-opt-level = "z"
-[profile.wasm-release.package.photocraft-web]
-opt-level = "z"
+# Decoding and rasterizing keep their speed.
+[profile.wasm-release.package.photocraft-codecs]
+opt-level = "s"
+[profile.wasm-release.package.photocraft-psd]
+opt-level = "s"
+[profile.wasm-release.package.photocraft-raw]
+opt-level = "s"
+[profile.wasm-release.package.photocraft-heif]
+opt-level = "s"
+[profile.wasm-release.package.photocraft-vector]
+opt-level = "s"
 
+# Pixel processing keeps its speed-oriented optimization level.
 [profile.wasm-release.package.photocraft-raster]
 opt-level = 3
 [profile.wasm-release.package.photocraft-color]