CI: run compile_graphics.sh to generate .svg.vec icon assets

Empty action-row buttons (Send/Receive/Swap/Scan) and empty bottom
navbar tabs are the same root cause on Linux + Android (+ likely iOS):
the workflows weren't running Cake's compile_graphics.sh, which is
what converts res/pictures/*.svg sources → assets/new-ui/*.svg.vec
precompiled vector assets that CakeImageWidget loads via
AssetBytesLoader.

History: commit 89e07fbba (Cake upstream, March 2026) moved to
precompiled SVGs, added compile_graphics.sh, and added a 'Compile
graphics' workflow step. Then 980c0278b added \*.svg.vec to .gitignore
(so the artifacts are no longer tracked). End result: CI MUST run
compile_graphics.sh to produce the .vec files, or every CakeImageWidget
silently renders nothing.

Fix:
- Add vector_graphics_compiler: ^1.1.16 to dev_dependencies (the script
  invokes 'dart run vector_graphics_compiler ...' which needs the
  package in the project's deps for 'dart run' to find it).
- Add a 'Compile SVG assets' step to all four workflows, between
  generate_localization and the build/pod-install step.

This will populate assets/new-ui/ with ~82 .svg.vec files at build
time, so every CakeImageWidget reference (action row, navbar, top bar,
settings rows, etc.) resolves to its actual icon.

.github/workflows/build-android.yml

@@ -228,6 +228,9 @@ jobs:
       - name: Generate localization
         run: dart run tool/generate_localization.dart
 
+      - name: Compile SVG assets (res/pictures/*.svg → assets/new-ui/*.svg.vec)
+        run: ./compile_graphics.sh
+
       # ---- Compile + sign --------------------------------------------------
       # Universal APK (single binary covers all 4 ABIs, easy to sideload).
       - name: Build release APK (universal, all ABIs)

.github/workflows/build-ios-sim.yml

@@ -215,6 +215,9 @@ jobs:
       - name: Generate localization
         run: dart run tool/generate_localization.dart
 
+      - name: Compile SVG assets (res/pictures/*.svg → assets/new-ui/*.svg.vec)
+        run: ./compile_graphics.sh
+
       # CocoaPods: the iOS Podfile installs Flutter plugin pods. Required
       # before flutter build can link them.
       - name: pod install

.github/workflows/build-ios-testflight.yml

@@ -252,6 +252,9 @@ jobs:
       - name: Generate localization
         run: dart run tool/generate_localization.dart
 
+      - name: Compile SVG assets (res/pictures/*.svg → assets/new-ui/*.svg.vec)
+        run: ./compile_graphics.sh
+
       - name: pod install
         run: |
           cd ios

.github/workflows/build-linux.yml

@@ -161,6 +161,9 @@ jobs:
       - name: Generate localization
         run: dart run tool/generate_localization.dart
 
+      - name: Compile SVG assets (res/pictures/*.svg → assets/new-ui/*.svg.vec)
+        run: ./compile_graphics.sh
+
       # ---- Compile + package ----------------------------------------------
       - name: Build Linux app
         run: flutter build linux --dart-define-from-file=env.json --release