Use FVM in GitHub Actions and migrate to Flutter 3.32.4 (#641)

* feat: implement Flutter version management using FVM across CI workflows

* Flutter 3.29.3 + minor Package upgrades

* Replace deprecated `withOpacity`

* Upgrade major package versions without breaking changes.

* Disable unnecessary_async rule

Re-enable later

* New language version and automated fixes

- unnecessary_breaks
- unnecessary_underscore

* Update BUILDING.md to use fvm commands

* Add gitignore files for Android and iOS build artifacts

* Migrate iOS dependencies to Swift Package Manager

This is being done automatically by Flutter

* Flutter 3.32.4

* New sdk version

* docs: add IDE setup instructions and troubleshooting guide for FVM integration

tasks.py

@@ -8,7 +8,7 @@ from invoke import task
 @task
 def clean(c):
     """Clean flutter build."""
-    c.run("flutter clean")
+    c.run("fvm flutter clean")
 
 @task
 def update(c):
@@ -20,20 +20,20 @@ def translate(c):
     """Update translation files."""
 
     here = os.path.dirname(__file__)
-    l10_dir = os.path.join(here, 'lib', 'l10n')
+    l10_dir = os.path.join(here, "lib", "l10n")
     l10_dir = os.path.abspath(l10_dir)
 
-    python = 'python3' if sys.platform.lower() == 'darwin' else 'python'
+    python = "python3" if sys.platform.lower() == "darwin" else "python"
     c.run(f"cd {l10_dir} && {python} collect_translations.py")
 
 
 @task(pre=[clean, update, translate])
 def ios(c):
     """Build iOS app in release configuration."""
-    c.run("flutter build ipa --release --no-tree-shake-icons")
+    c.run("fvm flutter build ipa --release --no-tree-shake-icons")
 
 
 @task(pre=[clean, update, translate])
 def android(c):
     """Build Android app in release configuration."""
-    c.run("flutter build appbundle --release --no-tree-shake-icons")
+    c.run("fvm flutter build appbundle --release --no-tree-shake-icons")