fix(scripts): add missing exit after error handlers

Critical bugs where error paths print a message but don't stop execution:
- install-fonts.sh: cd failure now exits properly
- install-ntfy.sh: unsupported OS case now exits with error
- install-git-crypt.sh: git clone and cd failures now exit properly

scripts/install-fonts.sh

@@ -21,7 +21,7 @@ clone_or_update_repo()
     git clone --quiet --filter=blob:none --sparse --depth=1 "$GIT_REPO" "$TMP_PATH"
   fi
 
-  cd "$TMP_PATH" || msgr err "No such folder $TMP_PATH"
+  cd "$TMP_PATH" || { msgr err "No such folder $TMP_PATH"; exit 1; }
 }
 
 # Function to add fonts to sparse-checkout

scripts/install-git-crypt.sh

@@ -19,8 +19,8 @@ if ! command -v git-crypt &> /dev/null; then
   rm -rf "$BUILD_PATH"
 
   if [ ! -d "$CHECK_PATH" ]; then
-    git clone --depth 1 "$REPO_URL" "$BUILD_PATH" || true
-    cd "$BUILD_PATH" || msg_err "$BUILD_PATH not found"
+    git clone --depth 1 "$REPO_URL" "$BUILD_PATH" || { msgr err "Failed to clone $REPO_URL"; exit 1; }
+    cd "$BUILD_PATH" || { msgr err "$BUILD_PATH not found"; exit 1; }
     make && make install PREFIX="$HOME/.local"
   else
     msgr run_done "git-crypt ($CHECK_PATH) already installed"

scripts/install-ntfy.sh

@@ -23,6 +23,7 @@ case $(dfm check arch) in
     ;;
   *)
     msgr err "Unsupported OS"
+    exit 1
     ;;
 esac